<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
		"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
	<title>查看详情</title>
	<link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/commonStuExam.css?v=2022-1111-1428"/>
	<link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/q_marking_icon.css"/>
	<link href="/exam-ans/mooc2/css/style.css" type="text/css" rel="stylesheet">
	<link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/viewStudent.css?v=2023-0606-1655"/>
	<link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/taskStudent_pop.css?v=2022-1021-1736" />
	<link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/newBuiltStudent.css?v=2023-0529-1809"/>
	<link href="/exam-ans/css/questionBank/questionBankUsual.css?v=2019-1120-1400" type="text/css" rel="stylesheet"/>	        <link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/notAllowCopy.css"/>
    </head>
<style>
	.questionLi img {
		max-width: 100%;
	}
    .AnswerCard span:last-child{border-right:none}
	        /*收藏按钮样式*/
        .Sub_tit_box{position:relative;padding-right:106px;}
        .Sub_tit_box a.tit_collcet_btn{position:absolute;right:0;top:0;width:76px;height: 28px;
            display: inline-block; border: solid #3A8BFF 1px;border-radius:36px;
            text-align:center;line-height:26px;font-size:14px;color: #3A8BFF;box-sizing: border-box;}
        .Sub_tit_box a.tit_collcet_btn i{display:inline-block;width:14px;height:14px;
            background:url(/exam-ans/mooc2/images/sc_icon.png) no-repeat;background-size:100%;
            vertical-align:middle;margin:-2px 6px 0 0;}
    	.over_collect_btn {opacity:0.4;}
    /*pointer-events: none;*/
	</style>
<body>
	<script type="text/javascript" src="//mooc-res1.chaoxing.com/exam-ans/js/common/jquery.min.js"></script>
<script type="text/javascript" src="//mooc-res1.chaoxing.com/exam-ans/js/common/jquery-migrate.min.js"></script>		<script src="/exam-ans/space/work/js/preview-attach.js?v=2022-0921-1530"></script>	<link href="/exam-ans/css/work/viewer.min.css?v=2021-0830-1700" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="/exam-ans/js/jquery.md5.js"></script>
<script type="text/javascript" src="/exam-ans/space/work/js/viewer-jquery.min.js?v=2021-0706-1800"></script>
<script type="text/javascript">
try{
	$(function(){
		var imgList = $(".TiMu").find("div img:not(.workAttach img, .attach img, .attachNew img, .stuAnswerArea img, .popClose img, .ans-formula-moudle, .no_view)");
		for (var i = 0, len = imgList.size(); i < len; i++) {
			 var src = imgList.eq(i).attr("src");
			 if(src){
    			var index = src.indexOf("375_1024");
    			if (index != -1) {
    				src = src.replace("375_1024", "origin");
    			}
                 var index2 = src.indexOf("750_1024");
                 if (index2 != -1) {
                     src = src.replace("750_1024", "origin");
                 }
    			imgList.eq(i).attr("data-original", src);
		   }
		}
        $(".TiMu").find("div img:not(.workAttach img, .attach img, .attachNew img, .stuAnswerArea img, .popClose img, .no_view)").viewer({
			url : 'data-original',
		});
	})
  }catch(error){}
</script><script type="text/javascript" src="/exam-ans/js/jquery.nicescroll.min.js"></script>
<link rel="stylesheet" type="text/css" href="/exam-ans/mooc2/css/pop.css"/>
<script type="text/javascript" src="/exam-ans/mooc2/js/poptoast.js"></script>
<script type="text/javascript" src="/exam-ans/mooc2/js/selectBox.js?v=2021-0629-1508"></script>
<script type="text/javascript" src="/exam-ans/js/phone/textareaHeightAuto.js"></script>
<script type="text/javascript" src="/exam-ans/mooc2/js/exam/stu-exam-view.js?v=2020-0818-1701"></script>
<script src="/exam-ans/js/exam/phone/attach-mark-forPC.js?v=2022-0805-1100"></script><div class="subNav" tabindex="0" role="option" aria-label="考试详情 页面">
	    考试详情</div>
<div class="het40"></div>

<input type="hidden" id="courseId" value="203030532"/>
<input type="hidden" id="classId" value="71949412"/>
<input type="hidden" id="cpi" value="198382912"/>
<input type="hidden" id="selfexamenc" value="f31c015187dbe94efbff1b5666d7e3cd"/>


<div class="fanyaMarking TiMu" id="fanyaMarking">
				<div class="fanyaMarking_left whiteBg">
			<div class="borderBom padBom20 detailsHead">
				<h2 class="mark_title" tabindex="0" role="option" >12</h2>
				<div class="infoHead fl" tabindex="0" role="option" >
					<span>题量：  340 </span>
										<div style="margin-top:10px;margin-left:-9px;">
					<p>
						考试时间：<em style="font-weight:normal; font-style:normal;">2023-07-04 15:15</em>至<em style="font-weight:normal; font-style:normal;">2023-07-04 16:15</em>
					</p>
					</div>

														</div>
				
									<div class="analysisCard fl"><a tabindex="-1" target="_blank" href="https://stat2-ans.chaoxing.com/study-knowledge/ans?courseid=203030532&cpi=198382912&clazzid=71949412&ut=s&relationId=3728545&type=4"><i></i>智能分析</a></div>
				                <div class="clear"></div>
	
																</div>
			
			
					

						<input type="hidden" id="stuCpi" value="198382912"/>
			<input type="hidden" id="isStudent" value="true"/>
			<div class="mark_table padTop60">
				<div class="mark_item ans-cc">
										
						
						<h2 tabindex="0" role="option" class="type_tit">一. 单选题（共200
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497362" id="question883497362" data="883497362">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(单选题)</span>TCP&nbsp;和&nbsp;UDP&nbsp;协议的相似之处是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('dba51b9bf59f4d68a085b9dc9ab0b8f5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 面向连接的协议</li>
                                    <li tabindex="0" role="option" >B. 面向非连接的协议</li>
                                                        <li tabindex="0" role="option" >C. 运输层协议</li>
                                    <li tabindex="0" role="option" >D. 其它三种均不对</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;和&nbsp;UDP&nbsp;是运输层的两个主要协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497363" id="question883497363" data="883497363">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(单选题)</span>路由器的路由表如下表所示：<BR>匹配网络&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一跳<BR>206.0.71.64/26&nbsp;&nbsp;&nbsp;P6<BR>206.0.71.0/25&nbsp;&nbsp;&nbsp;&nbsp;P5<BR>206.0.70.0/24&nbsp;&nbsp;&nbsp;&nbsp;P4<BR>206.0.68.0/23&nbsp;&nbsp;&nbsp;&nbsp;P3<BR>206.0.68.0/22&nbsp;&nbsp;&nbsp;&nbsp;P2<BR>206.0.64.0/18&nbsp;&nbsp;&nbsp;&nbsp;P1<BR>若该路由器收到一个目的&nbsp;IP&nbsp;地址为&nbsp;D=206.0.71.67&nbsp;的&nbsp;IP&nbsp;报文，问该报文的下一跳是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('707984e465034b3c9100a6aa26756f82', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. P1</li>
                                    <li tabindex="0" role="option" >B. P2</li>
                                    <li tabindex="0" role="option" >C. P5</li>
                                                        <li tabindex="0" role="option" >D. P6</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】根据&nbsp;CIDR&nbsp;路由算法原理可知：
<br>（1）找出能与目的&nbsp;IP&nbsp;地址网络相匹配的项目。
<br>把目的地址与路由表中的每个子网掩码进行逻辑与得到目的网络与本项的目的网络进行对比，检验是否匹配，其计算结果如下：
<br>D.and.（255.255.255.192）=206.0.71.64&nbsp;匹配
<br>D.and.（255.255.255.128）=206.0.71.0&nbsp;匹配
<br>D.and.（255.255.255.0）=206.0.71.0&nbsp;&nbsp;不匹配
<br>D.and.（255.255.254.0）=206.0.70.0&nbsp;&nbsp;不匹配
<br>D.and.（255.255.252.0）=206.0.68.0&nbsp;&nbsp;匹配
<br>D.and.（255.255.192.0）=206.0.64.0&nbsp;&nbsp;匹配
<br>（2）找最佳匹配项目。
<br>通过比较可知：206.0.71.64/26&nbsp;对应的项目是最佳项目，因此，目的地址为&nbsp;D=206.0.71.67&nbsp;的报文的下一跳为&nbsp;P6。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497364" id="question883497364" data="883497364">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(单选题)</span>若数据链路的发送窗口尺寸&nbsp;WT=4，在发送&nbsp;3&nbsp;号帧、并接到&nbsp;2&nbsp;号帧的确认帧后，发送方还可连续发送的帧数是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1ae75959e42047cbb4a25690aa0e9e01', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 2&nbsp;帧</li>
                                                        <li tabindex="0" role="option" >B. 3&nbsp;帧</li>
                                    <li tabindex="0" role="option" >C. 4&nbsp;帧</li>
                                    <li tabindex="0" role="option" >D. 1&nbsp;帧</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】本题考查滑动窗口的机制，这里收到&nbsp;2&nbsp;号帧的确认后，2&nbsp;号帧及以前的帧已经正确接收，目前已经发送了&nbsp;3&nbsp;号帧，发送并等待确认的帧只有&nbsp;3&nbsp;号帧一个帧，因此还可连续发送的帧数是窗口大小-已经发送的帧数，&nbsp;即&nbsp;4-1=3。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497365" id="question883497365" data="883497365">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(单选题)</span>下列不是&nbsp;TCP/IP&nbsp;协议层次的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('05ae1dd2284e4c93a4751ad193a2fa8e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 物理层</li>
                                    <li tabindex="0" role="option" >B. 互联网层</li>
                                                        <li tabindex="0" role="option" >C. 会话层</li>
                                    <li tabindex="0" role="option" >D. 应用层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;协议层次有物理层、数据链路层、网络层和应用层。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497366" id="question883497366" data="883497366">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(单选题)</span>下列哪一项不是&nbsp;TCP&nbsp;协议的特点（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('efa199c656ad43508f04f79c5788fd4c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 面向连接</li>
                                    <li tabindex="0" role="option" >B. 可靠交付</li>
                                    <li tabindex="0" role="option" >C. 面向字节流</li>
                                                        <li tabindex="0" role="option" >D. 首部开销小</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;的特点主要有：
<br>面向连接服务；
<br>点对点通信；
<br>可靠交付；
<br>全双工通信；
<br>面向字节流。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497367" id="question883497367" data="883497367">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">6. <span
											class="colorShallow">(单选题)</span>选择性重传与窗口大小的关系是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c6ceb74bfb1249a092cc339fcfac142b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. WT〉1，WR=1</li>
                                    <li tabindex="0" role="option" >B. WT=WR=1</li>
                                    <li tabindex="0" role="option" >C. WT=1，WR〉1</li>
                                                        <li tabindex="0" role="option" >D. WT〉1，WR〉1</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】停止-等待协议，发送窗口和接收窗口均等于&nbsp;1。
<br>回退&nbsp;N&nbsp;协议，发送窗口大于&nbsp;1，而接收窗口等于&nbsp;1。
<br>选择性重传协议，发送窗口和接收窗口均大于&nbsp;1。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497368" id="question883497368" data="883497368">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">7. <span
											class="colorShallow">(单选题)</span>提供远程管理网络设备功能的网络管理标准是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2e2d50a48997491fae7ff8c8cce513d1', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. SMTP</li>
                                    <li tabindex="0" role="option" >B. FTP</li>
                                                        <li tabindex="0" role="option" >C. SNMP</li>
                                    <li tabindex="0" role="option" >D. HTTP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】提供远程管理网络设备功能的网络管理标准是简单网络管理（SNMP）协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497369" id="question883497369" data="883497369">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">8. <span
											class="colorShallow">(单选题)</span>误码率是衡量一个通信系统传输可靠性的重要参数。对于一个实际的系统来说，（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bcbb7f97efce487cad40253ef479d865', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 误码率越低越好</li>
                                    <li tabindex="0" role="option" >B. 误码率越高越好</li>
                                                        <li tabindex="0" role="option" >C. 根据实际要求确定误码率</li>
                                    <li tabindex="0" role="option" >D. 误码率高低关系不大</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】误码率是衡量一个通信系统传输可靠性的重要参数。
<br>误码率是指在数据传输系统中二进制位数被传错的概率&nbsp;P，它在数值上近似等于：P=Ne/N。式中：N&nbsp;为传输的二进制位总数，Ne&nbsp;为被传错的位数。对于一个实际的数据传输系统，要根据实际传输要求提出误码率，不能一味追求低误码率。计算机网络通信的误码率要求低于&nbsp;10⁻⁶～10⁻⁹。过低的误码率要求，将使得传输系统设备复杂而提高代价。由于差错的出现具有随机性，在实际测量一个数据传输系统时，只有被测量的传输二进制码元数足够大，才能接近于系统真正的误码率值。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497370" id="question883497370" data="883497370">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">9. <span
											class="colorShallow">(单选题)</span>TCP&nbsp;使用滑动窗口进行流量控制，流量控制实际上是对（&nbsp;&nbsp;）的控制。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1bbc3545981d42b99dacb1115ad778a3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 接收方数据流量</li>
                                                        <li tabindex="0" role="option" >B. 发送方数据流量</li>
                                    <li tabindex="0" role="option" >C. 收发双方数据流量</li>
                                    <li tabindex="0" role="option" >D. 链路上任意两个结点间的数据流量</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;使用滑动窗口进行流量控制，流量控制实际上是通过接收方的窗口大小对发送方进行流量控制的。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497371" id="question883497371" data="883497371">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">10. <span
											class="colorShallow">(单选题)</span>Gigabit&nbsp;Ethernet&nbsp;的传输速率比传统的&nbsp;10&nbsp;Mbps&nbsp;Ethernet&nbsp;快&nbsp;100&nbsp;倍，但是它仍然保留着和传统的&nbsp;Ethernet&nbsp;的相同的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d1f31eab68dc4d6c980ee0420a579982', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 物理层协议</li>
                                                        <li tabindex="0" role="option" >B. 帧格式</li>
                                    <li tabindex="0" role="option" >C. 网卡</li>
                                    <li tabindex="0" role="option" >D. 集线器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】快速以太网。
<br>[评析]&nbsp;Gigabit&nbsp;Ethernet&nbsp;的传输速率比传统的&nbsp;10&nbsp;Mbps&nbsp;Ethernet&nbsp;快&nbsp;100&nbsp;倍，但是它仍然保留着和传统的&nbsp;Ethernet&nbsp;的相同的所有特征（相同的数据帧格式、相同的介质访问控制方法、相同的组网方法）。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497372" id="question883497372" data="883497372">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">11. <span
											class="colorShallow">(单选题)</span>某主机的&nbsp;IP&nbsp;地址为&nbsp;202.93.120.15，该主机的直接广播地址为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('537dbbeb22b94304a8ba88a34ee2b6f5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 255.255.255.255</li>
                                    <li tabindex="0" role="option" >B. 202.93.120.0</li>
                                    <li tabindex="0" role="option" >C. 255.111.255.255</li>
                                                        <li tabindex="0" role="option" >D. 202.93.120.255</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】直接广播地址是指包含一个有效的网络号和一个全“1”的主机号、主机的&nbsp;IP&nbsp;地址为&nbsp;202.93.120.15，这是一个&nbsp;C&nbsp;类&nbsp;IP&nbsp;地址，C&nbsp;类&nbsp;IP&nbsp;地址的主机号为&nbsp;8&nbsp;位，因此主机所在网络的网络号是&nbsp;202.93.120.0，因此直接广播地址是&nbsp;202.93.120.255。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497373" id="question883497373" data="883497373">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">12. <span
											class="colorShallow">(单选题)</span>最长的&nbsp;PPP&nbsp;协议帧为（&nbsp;&nbsp;）字节。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e55abb0033af478099cca4b76832862b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 65535</li>
                                    <li tabindex="0" role="option" >B. 1500</li>
                                                        <li tabindex="0" role="option" >C. 1508</li>
                                    <li tabindex="0" role="option" >D. 1518</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】PPP&nbsp;协议结构由帧头&nbsp;5&nbsp;个字节、帧尾&nbsp;3&nbsp;个字节和信息部分（最多&nbsp;1500&nbsp;个字节）组成，因此，最长的PPP&nbsp;协议为&nbsp;1508&nbsp;个字节。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497374" id="question883497374" data="883497374">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">13. <span
											class="colorShallow">(单选题)</span>假设拥塞窗口为&nbsp;20&nbsp;KB，接收窗口为&nbsp;30&nbsp;KB，TCP&nbsp;能够发送的最大字节数是（&nbsp;&nbsp;）KB。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('409b5b207c0a4b41979cf845d86d8e43', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 20</li>
                                    <li tabindex="0" role="option" >B. 30</li>
                                    <li tabindex="0" role="option" >C. 50</li>
                                    <li tabindex="0" role="option" >D. 10</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】发送窗口取拥塞窗口和接收窗口的较小值。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497375" id="question883497375" data="883497375">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">14. <span
											class="colorShallow">(单选题)</span>邮件服务器之间传递邮件通常使用的协议为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c88125e6051b40159497c4a666c00a01', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. HTTP</li>
                                                        <li tabindex="0" role="option" >B. SMTP</li>
                                    <li tabindex="0" role="option" >C. SNMP</li>
                                    <li tabindex="0" role="option" >D. Telnet</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】邮件服务器之间采用简单邮件传输协议（Simple&nbsp;Mail&nbsp;Transfer&nbsp;Protocol，SMTP）相互传递电子邮件。电子邮件应用程序使用&nbsp;SMTP&nbsp;协议向邮件服务器发送邮件，使用&nbsp;POP3（Post&nbsp;Office&nbsp;Protocol）协议或&nbsp;IMAP（Interactive&nbsp;Mail&nbsp;Access&nbsp;Protocol）协议从邮件服务器的邮箱中读取邮件。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497376" id="question883497376" data="883497376">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">15. <span
											class="colorShallow">(单选题)</span>以下（&nbsp;&nbsp;）是有效的&nbsp;IP&nbsp;地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c6b4b8bb1de842dd8c3eda5be6ee5352', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 202.280.130.45</li>
                                                        <li tabindex="0" role="option" >B. 130.192.33.45</li>
                                    <li tabindex="0" role="option" >C. 192.257.130.45</li>
                                    <li tabindex="0" role="option" >D. 280.192.33.456</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;地址的直观表示法。
<br>[评析]&nbsp;IP&nbsp;地址由&nbsp;32&nbsp;位二进制数值组成（4&nbsp;个字节），但为了方便用户的理解和记忆，它采用了点分十进制标记法，即将&nbsp;4&nbsp;个字节的二进制数值转换成&nbsp;4&nbsp;个十进制数值，每个数值小于等于&nbsp;255，数值中间用“.”隔开，表示成&nbsp;w.x.y.z&nbsp;的形式。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497377" id="question883497377" data="883497377">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">16. <span
											class="colorShallow">(单选题)</span>下列描述是互联网比较恰当的定义是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('18207b1227fd496496ea90284430c670', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 一个协议</li>
                                                        <li tabindex="0" role="option" >B. 一个由许多个网络组成的网络</li>
                                    <li tabindex="0" role="option" >C. OSI模型的下三层</li>
                                    <li tabindex="0" role="option" >D. 一种内部网络结构</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】互联网是一个由许多个网络组成的全球范围的互联网络。接入互联网的主机既可以是信息资源及服务的提供者（服务器），也可以是信息资源及服务的消费者（客户机）。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497378" id="question883497378" data="883497378">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">17. <span
											class="colorShallow">(单选题)</span>计算机网络的传输介质中性能最好、应用前途最广泛的一种是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8a3716014f7f4390b3509dd254b573b2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 无线电</li>
                                                        <li tabindex="0" role="option" >B. 光纤</li>
                                    <li tabindex="0" role="option" >C. 同轴电缆</li>
                                    <li tabindex="0" role="option" >D. 双绞线</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】光纤又称光导纤维，它是由石英玻璃拉成的细丝。实际使用中再加上加强芯和填充物做成结实的光缆。一根光缆中可以包括多达数百根光纤。目前常用的光纤有两类：一类是多模光纤，在纤芯内不同的光线将以不同角度反射传播；另一类是单模光纤，光在纤芯内没有反射，而沿直线传播。光纤的优点体现在多个方面，首先，它的传输的数据率可以达到几千&nbsp;Mbps，传输频带可上&nbsp;10¹⁴～10¹⁷&nbsp;Hz，因而通信容量大。其次介质传输损耗小，在无中继器的情况下，传输距离可达&nbsp;6～8&nbsp;Km。另外具有抗电磁干扰性能强、传输的误码率很低、保密性好、重量轻、体积小、铺设容易等优异的特性，所以在计算机网络的传输介质中是性能最好、应用前途最广泛的一种。目前光缆中光纤质脆，机械强度低，所以安装、连接和分接都较复杂，价格也比较昂贵，主要用于对传输速率、保密性、抗干扰性要求高的主干网上。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497379" id="question883497379" data="883497379">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">18. <span
											class="colorShallow">(单选题)</span>在互联网中，地址解析协议&nbsp;ARP&nbsp;是用来解析（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('221e0be4f97b4f98a52b78be2ae7c828', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. IP地址与MAC地址的对应关系</li>
                                    <li tabindex="0" role="option" >B. MAC地址与端口号的对应关系</li>
                                    <li tabindex="0" role="option" >C. IP地址与端口号的对应关系</li>
                                    <li tabindex="0" role="option" >D. 端口号与主机名的对应关系</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络协议。
<br>[评析]&nbsp;所谓地址解析，就是主机在发送帧前将目标&nbsp;IP&nbsp;地址转换成目标&nbsp;MAC&nbsp;地址的过程。ARP&nbsp;协议的基本功能就是通过目标设备的&nbsp;IP&nbsp;地址，查询目标设备的&nbsp;MAC&nbsp;地址，以保证通信的顺利进行。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497380" id="question883497380" data="883497380">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">19. <span
											class="colorShallow">(单选题)</span>以太网帧数据字段的最大长度是（&nbsp;&nbsp;）B。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('98b741280ab145e182b2ab7102b1bd85', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 1518</li>
                                                        <li tabindex="0" role="option" >B. 1500</li>
                                    <li tabindex="0" role="option" >C. 1024</li>
                                    <li tabindex="0" role="option" >D. 1000</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】以太网帧数据字段的最小长度为&nbsp;46&nbsp;B，最大长度为&nbsp;1500&nbsp;B。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497381" id="question883497381" data="883497381">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">20. <span
											class="colorShallow">(单选题)</span>静态路由适合于（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0ea848ec1c1543fd8d87c9dd97f02c77', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 链路状态和拓扑结构经常发生变化的环境</li>
                                                        <li tabindex="0" role="option" >B. 小型的、网络拓扑没有变化</li>
                                    <li tabindex="0" role="option" >C. 网络状态复杂的环境</li>
                                    <li tabindex="0" role="option" >D. 大型网络环境</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】静态路由只适合于小型的、网络拓扑没有变化。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497382" id="question883497382" data="883497382">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">21. <span
											class="colorShallow">(单选题)</span>DHCP&nbsp;协议的功能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b3a62180306c438ca06e27b4dfa119f3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 为客户自动进行注册</li>
                                    <li tabindex="0" role="option" >B. 提供路由</li>
                                    <li tabindex="0" role="option" >C. 使DNS名字自动登录</li>
                                                        <li tabindex="0" role="option" >D. 为客户机自动配置IP地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】DHCP&nbsp;协议主要是为客户机自动配置&nbsp;IP&nbsp;地址。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497383" id="question883497383" data="883497383">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">22. <span
											class="colorShallow">(单选题)</span>局域网中的“共享介质”所指的共享是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d8fcc010199b436384e94c28481d26f0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 存储介质</li>
                                    <li tabindex="0" role="option" >B. 纸介质</li>
                                                        <li tabindex="0" role="option" >C. 数据传输介质</li>
                                    <li tabindex="0" role="option" >D. 中间介质</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由于局域网的覆盖范围比较小，因此局域网的数据通信机制一般采用的是“共享介质”方式和交换方式。这里的“共享介质”是指共享数据通信线路，也就是数据通信介质。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497384" id="question883497384" data="883497384">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">23. <span
											class="colorShallow">(单选题)</span>TCP/IP&nbsp;参考模型的网络层提供的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e3252248efac4124b4699c9be42e1859', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 无连接的不可靠的数据报服务</li>
                                    <li tabindex="0" role="option" >B. 无连接的可靠的数据报服务</li>
                                    <li tabindex="0" role="option" >C. 有连接不可靠的虚电路服务</li>
                                    <li tabindex="0" role="option" >D. 有连接可靠的虚电路服务</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;参考模型的网络层提供的是无连接的不可靠的数据报服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497385" id="question883497385" data="883497385">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">24. <span
											class="colorShallow">(单选题)</span>在转发数据包时，网络层所使用的主要信息依据是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e9c1b9bbc7164a6797ccefd675ebc4c3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. IP&nbsp;路由表</li>
                                    <li tabindex="0" role="option" >B. RP&nbsp;响应</li>
                                    <li tabindex="0" role="option" >C. 桥接表</li>
                                    <li tabindex="0" role="option" >D. 名字服务器的数据</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在转发数据包时，网络层所使用的主要信息依据是路由表。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497386" id="question883497386" data="883497386">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">25. <span
											class="colorShallow">(单选题)</span>以下&nbsp;IP&nbsp;组播的特点描述中不正确的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('ddab51c6e2a442c48bd450822e08dd5e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 使用组播地址</li>
                                    <li tabindex="0" role="option" >B. 组成员是动态的</li>
                                    <li tabindex="0" role="option" >C. 可利用底层硬件</li>
                                                        <li tabindex="0" role="option" >D. 发送方必须是组成员</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】组播的发送方可以是任何人，不一定是组成员。组播的特点：组播使用组播地址，组成员是动态的，底层硬件支持的组播。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497387" id="question883497387" data="883497387">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">26. <span
											class="colorShallow">(单选题)</span>将内部专用&nbsp;IP&nbsp;地址转换为外部公用&nbsp;IP&nbsp;地址的技术是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('ac5b0bf4fc5a478daaef697a113f4643', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. VOIP</li>
                                                        <li tabindex="0" role="option" >B. NAT</li>
                                    <li tabindex="0" role="option" >C. DHCP</li>
                                    <li tabindex="0" role="option" >D. ARP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】VoIP（Voice&nbsp;over&nbsp;互联网&nbsp;Protocol，网络电话）简而言之就是将模拟信号（Voice）数字化，以数据封包（Data&nbsp;Packet）的形式在IP网络（IP&nbsp;Network）上做实时传递。
<br>NAT（Network&nbsp;Address&nbsp;Translation，网络地址转换技术）技术属于接入广域网（WAN）技术，是一种将私有（保留）地址转换为合法IP地址的转换技术，它被广泛应用于各种类型互联网接入方式和各种类型的网络中。
<br>DHCP（Dynamic&nbsp;Host&nbsp;Configuration&nbsp;Protocol，动态主机配置协议）是一个局域网的网络协议，使用&nbsp;UDP&nbsp;协议工作，主要有两个用途：给内部网络或网络服务供应商自动分配&nbsp;IP&nbsp;地址；给用户或者内部网络管理员作为对所有计算机作中央管理的手段。
<br>ARP（Address&nbsp;Resolution&nbsp;Protocol，地址解析协议）是主机在发送帧前将目标&nbsp;IP&nbsp;地址转换成目标&nbsp;MAC&nbsp;地址的过程。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497388" id="question883497388" data="883497388">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">27. <span
											class="colorShallow">(单选题)</span>TELNET&nbsp;为了解决计算机系统的差异性，引入了（&nbsp;&nbsp;）概念。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('01110ac94f624024801faacfdaea96ef', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 用户实终端</li>
                                                        <li tabindex="0" role="option" >B. 网络虚拟终端</li>
                                    <li tabindex="0" role="option" >C. 超文本</li>
                                    <li tabindex="0" role="option" >D. 统一资源定位地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由于不同的计算机以及操作系统之间存在着很多差异，为了能够适应这些差异，TELNET&nbsp;定义了数据和命令通过&nbsp;互联网的方法。这些定义就是所谓的网络虚拟终端。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497389" id="question883497389" data="883497389">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">28. <span
											class="colorShallow">(单选题)</span>对于&nbsp;/24&nbsp;的地址块，划分大小相同的子网，其子网掩码为&nbsp;255.255.255.248，则能提供子网数为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('793282e605864336bfc8a37fae4b27e4', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 16</li>
                                    <li tabindex="0" role="option" >B. 30</li>
                                                        <li tabindex="0" role="option" >C. 32</li>
                                    <li tabindex="0" role="option" >D. 128</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】255.255.255.248&nbsp;的掩码位为&nbsp;29&nbsp;位，子网占&nbsp;29-24=5&nbsp;&nbsp;&nbsp;位，其能提供的子网数为&nbsp;2⁵&nbsp;=32。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497390" id="question883497390" data="883497390">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">29. <span
											class="colorShallow">(单选题)</span>下列哪个运输层协议提供低开销传输，因而可用于不需要可靠数据传输的应用场合的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8c690ccd971044a38a03df09fe46c0d2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. TCP</li>
                                    <li tabindex="0" role="option" >B. IP</li>
                                                        <li tabindex="0" role="option" >C. UDP</li>
                                    <li tabindex="0" role="option" >D. HTTP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】如果对数据的实时性要求比较高，但对数据的准确性要求相对较低，一般可在运输层采用UDP协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497391" id="question883497391" data="883497391">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">30. <span
											class="colorShallow">(单选题)</span>在网络中计算机接收的信号是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7796f766610e4cb4b282e3b926397776', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 数字信号</li>
                                    <li tabindex="0" role="option" >B. 模拟信号</li>
                                    <li tabindex="0" role="option" >C. 广播信号</li>
                                    <li tabindex="0" role="option" >D. 脉冲信号</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在网络传输介质中传输的是模拟信号，计算机接收的是数字信号。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497392" id="question883497392" data="883497392">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">31. <span
											class="colorShallow">(单选题)</span>在脉冲编码调制中，若规定的量化级是&nbsp;256，则需要使用（&nbsp;&nbsp;）位编码。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('86f69fefa17e40cc8309c73f6b97624a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 5</li>
                                    <li tabindex="0" role="option" >B. 6</li>
                                    <li tabindex="0" role="option" >C. 7</li>
                                                        <li tabindex="0" role="option" >D. 8</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】㏒₂（256）=8。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497393" id="question883497393" data="883497393">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">32. <span
											class="colorShallow">(单选题)</span>在总线型拓扑结构网络中，每次可传输信号的设备数目为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('80ada6ceecb0455c8b1f8fc67021d4c7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 1个</li>
                                    <li tabindex="0" role="option" >B. 2个</li>
                                    <li tabindex="0" role="option" >C. 3个</li>
                                    <li tabindex="0" role="option" >D. 任意个</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】所有工作站都连在一条公共的电缆上，各节点发出的信息包都带有目的地址在网络中传输。这种网络拓扑结构比较简单，总线型中所有设备都直接与采用一条称为公共总线的传输介质相连。一次只能一个端用户发送数据，而且随着接入用户的增加，传输速度会下降。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497394" id="question883497394" data="883497394">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">33. <span
											class="colorShallow">(单选题)</span>联网计算机在相互通信时必须遵循统一的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a441d2ddafdb43ec8a56d9a2beb92db6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 软件规范</li>
                                                        <li tabindex="0" role="option" >B. 网络协议</li>
                                    <li tabindex="0" role="option" >C. 路由算法</li>
                                    <li tabindex="0" role="option" >D. 安全规范</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】本题考查点是网络协议的作用。联网计算机进行数据通信时，为了做到有条不紊地交换数据，每台计算机都必须遵守统一的网络协议。网络协议是指为网络数据通信而制定的规则、约定或标准。这一点和现实生活中的其他通信，例如邮政通信系统是相似的。计算机网络通信中要完成诸如信息表示、对话控制、顺序控制、路由选择、链路管理、差错控制、信号传送与接收等问题。这些问题的解决，必须要在网络通信中精确地规定通信时所交换数据的内容、格式和同步。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497395" id="question883497395" data="883497395">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">34. <span
											class="colorShallow">(单选题)</span>FTP&nbsp;数据传输端口号（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b5ad4b9e7ff8473190dc9e1b6f2a4eae', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 20</li>
                                    <li tabindex="0" role="option" >B. 21</li>
                                    <li tabindex="0" role="option" >C. 23</li>
                                    <li tabindex="0" role="option" >D. 25</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】文件传输协议&nbsp;FTP，用于控制连接的端口号为&nbsp;21，用于传输数据的端口号为&nbsp;20。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497396" id="question883497396" data="883497396">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">35. <span
											class="colorShallow">(单选题)</span>在&nbsp;TCP&nbsp;连接建立过程中，连接请求报文的初始序列号通常为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1023e94273a84e9ba705b5dca1ad2618', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 0</li>
                                    <li tabindex="0" role="option" >B. 1</li>
                                    <li tabindex="0" role="option" >C. 255</li>
                                                        <li tabindex="0" role="option" >D. 随机选择</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;TCP&nbsp;创建一个新连接的过程中，三次握手法要求每一端产生一个随机的&nbsp;32&nbsp;位初始序列号，以便和原来的连接区分开来，避免二义性的产生。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497397" id="question883497397" data="883497397">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">36. <span
											class="colorShallow">(单选题)</span>在双绞线组网的方式中，（&nbsp;&nbsp;）是以太网的中心连接设备。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('73e80122f45747c6bef7108608a84cdd', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 集线器</li>
                                    <li tabindex="0" role="option" >B. 收发器</li>
                                    <li tabindex="0" role="option" >C. 中继器</li>
                                    <li tabindex="0" role="option" >D. 网卡</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络互联技术与互联设备。
<br>[评析]&nbsp;在以双绞线组网的方式中，集线器是以太网的中心连接设备。各台计算机间通过双绞线经集线器相互联接并互相通信。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497398" id="question883497398" data="883497398">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">37. <span
											class="colorShallow">(单选题)</span>下列网络属于局域网的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('efb32e593418443b84fbdc78122294fe', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 互联网</li>
                                                        <li tabindex="0" role="option" >B. 校园网</li>
                                    <li tabindex="0" role="option" >C. 上海热线</li>
                                    <li tabindex="0" role="option" >D. 中国教育网</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网的特点是覆盖有限的地理范围、具有高数据传输率、通信时间延迟较低、结点数量有限，是一种通信网络，一般只有物理层和数据链路层，有的具有网络层。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497399" id="question883497399" data="883497399">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">38. <span
											class="colorShallow">(单选题)</span>网络上的用户的终端设备划分为若干个逻辑工作组，每个逻辑工作组称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cd7695aa14884a6eb4cb6ecdb53222a8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. VTP</li>
                                                        <li tabindex="0" role="option" >B. VLAN</li>
                                    <li tabindex="0" role="option" >C. VPS</li>
                                    <li tabindex="0" role="option" >D. VMS</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络上的用户的终端设备划分为若干个逻辑工作组，每个逻辑工作组称为虚拟局域网（VLAN）。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497400" id="question883497400" data="883497400">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">39. <span
											class="colorShallow">(单选题)</span>OSPF&nbsp;采用（&nbsp;&nbsp;）方式进行路由通告。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fe5ea09c65ce4e96acb3e247d1b6850f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 单播</li>
                                                        <li tabindex="0" role="option" >B. 组播</li>
                                    <li tabindex="0" role="option" >C. 广播</li>
                                    <li tabindex="0" role="option" >D. 其它答案都不对</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】OSPF&nbsp;路由协议报文只向其相邻的所有路由进行通告，而不是直接向全网的路由器进行广播，它属于组播。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497401" id="question883497401" data="883497401">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">40. <span
											class="colorShallow">(单选题)</span>网桥转发数据的依据是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('95c085780e4f472bacfd63532922cdd3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. ARP表</li>
                                                        <li tabindex="0" role="option" >B. MAC地址表</li>
                                    <li tabindex="0" role="option" >C. 路由表</li>
                                    <li tabindex="0" role="option" >D. 访问控制列表</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网桥最重要的维护工作是构建和维护&nbsp;MAC&nbsp;地址表。MAC&nbsp;地址表中记录不同节点的物理地址与网桥转发端口关系。如果没有&nbsp;MAC&nbsp;地址表，网桥无法确定帧是否需要转发，以及如何进行转发。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497402" id="question883497402" data="883497402">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">41. <span
											class="colorShallow">(单选题)</span>最简单的实现可靠传输的工作原理是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('360b5c3f80bd4c579483f8d7d4d3e601', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 身份确认</li>
                                    <li tabindex="0" role="option" >B. 分组传输</li>
                                                        <li tabindex="0" role="option" >C. 停止等待</li>
                                    <li tabindex="0" role="option" >D. 校验信息</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】最简单的实现可靠传输的工作原理是停止等待。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497403" id="question883497403" data="883497403">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">42. <span
											class="colorShallow">(单选题)</span>TCP&nbsp;连接释放的过程是（&nbsp;&nbsp;）次握（挥）手。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('dd62e354d9c545c9b88c41a17e149d34', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 4</li>
                                    <li tabindex="0" role="option" >B. 3</li>
                                    <li tabindex="0" role="option" >C. 2</li>
                                    <li tabindex="0" role="option" >D. 1</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;连接释放的过程是&nbsp;4&nbsp;次握（挥）手。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497404" id="question883497404" data="883497404">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">43. <span
											class="colorShallow">(单选题)</span>FTP&nbsp;客户端应用的端口号可能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1f50656741404a71979c1346b2233277', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 21</li>
                                    <li tabindex="0" role="option" >B. 20</li>
                                    <li tabindex="0" role="option" >C. 1024</li>
                                                        <li tabindex="0" role="option" >D. 65535</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】任何客户端应用的端口号中能是短暂（临时）端口号。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497405" id="question883497405" data="883497405">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">44. <span
											class="colorShallow">(单选题)</span>具有存储转发的数据交换技术有（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('987c013d6ac64e7b8f1f6ee6dc232e7c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 电路交换</li>
                                    <li tabindex="0" role="option" >B. 报文交换和电路交换</li>
                                    <li tabindex="0" role="option" >C. 分组交换和电路交换</li>
                                                        <li tabindex="0" role="option" >D. 报文交换和分组交换</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据交换技术的三种。具有存储转发方式的交换形式有报文交换和分组交换。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497406" id="question883497406" data="883497406">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">45. <span
											class="colorShallow">(单选题)</span>假设&nbsp;TCP&nbsp;的拥塞窗口被设置为&nbsp;18&nbsp;KB，且发生了一个超时，若接下来的&nbsp;4&nbsp;次传输全部成功，假定最大报文段为&nbsp;1&nbsp;KB，则拥塞窗口的大小是（&nbsp;&nbsp;）KB。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('82b8c5b30cdf4f298442e35389d325cc', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 4</li>
                                                        <li tabindex="0" role="option" >B. 8</li>
                                    <li tabindex="0" role="option" >C. 10</li>
                                    <li tabindex="0" role="option" >D. 12</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由于发生了超时，下一次传输将是&nbsp;1&nbsp;个最大报文段，然后是2&nbsp;个、4&nbsp;个、8&nbsp;个最大报文段，所以在&nbsp;4&nbsp;次突发量传输后，拥塞窗口将是&nbsp;8&nbsp;KB。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497407" id="question883497407" data="883497407">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">46. <span
											class="colorShallow">(单选题)</span>设某路由器建立了如下路由表：<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一跳<BR>192.4.153.0/26&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₃<BR>128.96.39.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m0<BR>128.96.39.128/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m1<BR>128.96.40.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₂<BR>*（默认）&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₄<BR>现收到目的&nbsp;IP&nbsp;地址&nbsp;128.96.39.10，其下一跳是（&nbsp;&nbsp;）。（4-18）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b468f87c08124d1a93c3b1879d4b8136', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 接口&nbsp;m0</li>
                                    <li tabindex="0" role="option" >B. 接口&nbsp;m1</li>
                                    <li tabindex="0" role="option" >C. R₂</li>
                                    <li tabindex="0" role="option" >D. R₃</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目的&nbsp;IP&nbsp;地址&nbsp;128.96.39.10&nbsp;与子网掩码&nbsp;255.255.255.128&nbsp;相与得&nbsp;128.96.39.0，可见该分组经接口&nbsp;m0&nbsp;转发。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497408" id="question883497408" data="883497408">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">47. <span
											class="colorShallow">(单选题)</span>FTP&nbsp;服务采用典型的客户机/服务器工作模式，其中将文件从服务器传到客户机称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bd42a1500a304f29817a08d0080ba87c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 访问文件</li>
                                                        <li tabindex="0" role="option" >B. 下载文件</li>
                                    <li tabindex="0" role="option" >C. 上载文件</li>
                                    <li tabindex="0" role="option" >D. 其它三种都不是</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】FTP&nbsp;服务采用典型的客户机/服务器工作模式，其中将文件从服务器传到客户机称为下载，从客户机把文件传输到服务器，称为上传或上载。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497409" id="question883497409" data="883497409">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">48. <span
											class="colorShallow">(单选题)</span>网络层的协议数据单元（PDU）是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c85a14e8dfba4f22ae8d03fe8b09af94', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 比特</li>
                                    <li tabindex="0" role="option" >B. 帧</li>
                                                        <li tabindex="0" role="option" >C. 分组</li>
                                    <li tabindex="0" role="option" >D. 报文</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络层的协议数据单元（PDU）是数据分组。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497410" id="question883497410" data="883497410">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">49. <span
											class="colorShallow">(单选题)</span>在以太网中的任何结点发送数据（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('79d74abae17441e2b29ad4490f6f75e6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 都是随机的</li>
                                    <li tabindex="0" role="option" >B. 都需要预约发送时间</li>
                                    <li tabindex="0" role="option" >C. 都是定时的，即按固定时间片发送</li>
                                    <li tabindex="0" role="option" >D. 需通过一个公式计算时间</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】以太网采用随机争用型介质访问控制方法，即&nbsp;CSMA/CD（载波监听多路访问/冲突检测）。这种介质访问控制方法属于随机争用型方法。网中任何结点随时可以发送数据，既不需要预约发送时间，也没有定时控制，数据发送都是随机的。由于网中没有设置控制中心，各结点是平等地争用发送时间，因此冲突是不可避免的。为此&nbsp;CSMA/CD&nbsp;采用“先听后发，边发边听，冲突停止，随机延迟重发”的策略来解决。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497411" id="question883497411" data="883497411">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">50. <span
											class="colorShallow">(单选题)</span>Ethernet&nbsp;交换机实质上是一个多端口的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('04642f7c00b74cb881ee80ede5c151ea', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 中继器</li>
                                    <li tabindex="0" role="option" >B. 集线器</li>
                                                        <li tabindex="0" role="option" >C. 网桥</li>
                                    <li tabindex="0" role="option" >D. 路由器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】Ethernet&nbsp;交换机。
<br>[评析]&nbsp;Ethernet&nbsp;交换机通过结点之间的多个并发连接，从而从根本上改变了集线器共享介质的工作方式，但它实质上还是一个多端口的网桥。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497412" id="question883497412" data="883497412">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">51. <span
											class="colorShallow">(单选题)</span>互联网起源于哪个网络?（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6c33810b784c47128723d70e7794bff2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. NSFNET</li>
                                    <li tabindex="0" role="option" >B. CERNET</li>
                                    <li tabindex="0" role="option" >C. CASNET</li>
                                                        <li tabindex="0" role="option" >D. ARPANET</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】互联网起源于&nbsp;ARPANET&nbsp;网络。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497413" id="question883497413" data="883497413">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">52. <span
											class="colorShallow">(单选题)</span>互联网是属于（&nbsp;&nbsp;）类型的拓扑结构。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('ff056378e5d149118cc8e8ea04efe826', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 端到端</li>
                                    <li tabindex="0" role="option" >B. 环状</li>
                                                        <li tabindex="0" role="option" >C. 网状</li>
                                    <li tabindex="0" role="option" >D. 分层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网状拓扑结构又称无规则型结构。在网状拓扑结构中，结点之间的连接是任意的，没有规律。网状拓扑的主要优点是系统可靠性高，但是结构复杂，必须采用路由选择算法与流量控制方法。目前实际存在和使用的广域网基本上都是采用网状拓扑结构。互联网是典型的网状结构的网络。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497414" id="question883497414" data="883497414">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">53. <span
											class="colorShallow">(单选题)</span>计算机网络体系结构中，下层的目的是向上一层提供（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('43ade8b3134c48b08e6ba3dba78b00fe', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 协议</li>
                                                        <li tabindex="0" role="option" >B. 服务</li>
                                    <li tabindex="0" role="option" >C. 规则</li>
                                    <li tabindex="0" role="option" >D. 数据包</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】下层的目的是向上一层提供服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497415" id="question883497415" data="883497415">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">54. <span
											class="colorShallow">(单选题)</span>一个&nbsp;/24&nbsp;的地址块，采用了&nbsp;255.255.255.240&nbsp;作为子网掩码，那么这个地址块可以划分为（&nbsp;&nbsp;）个大小相同子网。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('060469ff85ab4cadaf220a6d04f06ba6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 16</li>
                                    <li tabindex="0" role="option" >B. 32</li>
                                    <li tabindex="0" role="option" >C. 64</li>
                                    <li tabindex="0" role="option" >D. 128</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】/24&nbsp;地址块中对第四段的主机号是&nbsp;8&nbsp;位进行子网划分，将掩码的第四段转换成二进制&nbsp;11110000，子网占&nbsp;4&nbsp;位，因此可以得到&nbsp;16&nbsp;个相同大小的子网。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497416" id="question883497416" data="883497416">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">55. <span
											class="colorShallow">(单选题)</span>以下协议中不属于内部网关协议的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cb27b24b330b4afb94af89ad80a7b4e0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. RIP</li>
                                    <li tabindex="0" role="option" >B. OSPF</li>
                                                        <li tabindex="0" role="option" >C. BGP</li>
                                    <li tabindex="0" role="option" >D. IGP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】内部网关协议&nbsp;IGP&nbsp;主要有&nbsp;RIP&nbsp;和&nbsp;OSPF&nbsp;协议。BGP&nbsp;是边界网关协议，不是内部网关协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497417" id="question883497417" data="883497417">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">56. <span
											class="colorShallow">(单选题)</span>1000&nbsp;Base-FX&nbsp;网络采用的传输介质是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a37cf704d8dc400a9f014ad82ff0fcc2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 同轴电缆</li>
                                                        <li tabindex="0" role="option" >B. 光缆</li>
                                    <li tabindex="0" role="option" >C. 双绞线</li>
                                    <li tabindex="0" role="option" >D. 微波</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】1000&nbsp;Base-FX&nbsp;网络采用的传输介质是光缆（光纤）。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497418" id="question883497418" data="883497418">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">57. <span
											class="colorShallow">(单选题)</span>如果需要组建一个办公室局域网，其中有&nbsp;20&nbsp;台个人计算机与&nbsp;4&nbsp;台服务器，并且要与公司的局域网交换机连接，那么比较适合的一台连接设备是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3142463edb444bcebc5370f1200b8277', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 24端口10Mbps交换机</li>
                                    <li tabindex="0" role="option" >B. 24端口100Mbps交换机</li>
                                    <li tabindex="0" role="option" >C. 16端口10Mbps交换机</li>
                                                        <li tabindex="0" role="option" >D. 48端口100Mbps交换机</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】个人计算机需要&nbsp;20&nbsp;个端口，服务器需要&nbsp;4&nbsp;个端口，与公司的局域网交换机连接至少需要&nbsp;1&nbsp;个端口，总共需要&nbsp;25&nbsp;个端口。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497419" id="question883497419" data="883497419">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">58. <span
											class="colorShallow">(单选题)</span>IP&nbsp;地址&nbsp;21.85.1.3&nbsp;属于（&nbsp;&nbsp;）类地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('945efb4f4ecf4213b84949ac2be999ce', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. A</li>
                                    <li tabindex="0" role="option" >B. B</li>
                                    <li tabindex="0" role="option" >C. C</li>
                                    <li tabindex="0" role="option" >D. D</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】点分十进制法表示的&nbsp;IP&nbsp;地址，第&nbsp;1&nbsp;段十进制数，在&nbsp;0~127&nbsp;范围是&nbsp;A&nbsp;类地址，在&nbsp;128~191&nbsp;范围是&nbsp;B&nbsp;类地址，在&nbsp;192~223&nbsp;范围是&nbsp;C&nbsp;类地址，在&nbsp;224~239&nbsp;范围是&nbsp;D&nbsp;类地址，在&nbsp;240~247&nbsp;范围是&nbsp;E&nbsp;类地址。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497420" id="question883497420" data="883497420">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">59. <span
											class="colorShallow">(单选题)</span>对分片后的数据报进行重组的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8864f791c0b6457eba2cb39e03d780a9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 目的端系统</li>
                                    <li tabindex="0" role="option" >B. 中间主机</li>
                                    <li tabindex="0" role="option" >C. 核心路由器</li>
                                    <li tabindex="0" role="option" >D. 下一跳路由器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据报分组从源端发送到目的端的过程中，期间可能会经过不同的路径，只有目的端系统能够收到一个数据报的所有分组，因此，分片的重组工作只能在目的端系统进行。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497421" id="question883497421" data="883497421">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">60. <span
											class="colorShallow">(单选题)</span>以太网交换机是通过读取帧的（&nbsp;&nbsp;）并记录帧进入交换机的端口进行地址学习的。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f2ea3ebdaca74be8bc9748e5ad890ccb', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 源&nbsp;IP&nbsp;地址</li>
                                                        <li tabindex="0" role="option" >B. 源&nbsp;MAC&nbsp;地址</li>
                                    <li tabindex="0" role="option" >C. 目标&nbsp;IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >D. 目标&nbsp;MAC&nbsp;地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】交换机利用帧的源&nbsp;MAC&nbsp;地址进行自学习法来构建&nbsp;MAC&nbsp;地址表。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497422" id="question883497422" data="883497422">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">61. <span
											class="colorShallow">(单选题)</span>计算机网络中可以共享的资源包括（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5e6032dd6a5f4a2d9c7326b947c790f0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 硬件、软件、数据、通信信道</li>
                                    <li tabindex="0" role="option" >B. 主机、外设、软件、通信信道</li>
                                    <li tabindex="0" role="option" >C. 硬件、程序、数据、通信信道</li>
                                    <li tabindex="0" role="option" >D. 主机、程序、数据、通信信道</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】计算机网络中，硬件、软件、数据、通信信道这些资源是可以共享的。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497423" id="question883497423" data="883497423">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">62. <span
											class="colorShallow">(单选题)</span>在&nbsp;DNS&nbsp;的名字中，顶级域名的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('954e8c8b992341d2bc6a30238e760a33', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 最前面的部分</li>
                                    <li tabindex="0" role="option" >B. 中间部分</li>
                                                        <li tabindex="0" role="option" >C. 最后部分</li>
                                    <li tabindex="0" role="option" >D. 其它</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在域名结构中，自己的域名最小，应在域名的最左边，顶级域名最大，应该在最右边。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497424" id="question883497424" data="883497424">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">63. <span
											class="colorShallow">(单选题)</span>基于&nbsp;TCP/IP&nbsp;的互联网服务中，&nbsp;UDP&nbsp;协议提供（&nbsp;&nbsp;）的服务。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('270b346576974a269f4edbc568f5aa8c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 可靠的</li>
                                    <li tabindex="0" role="option" >B. 按序交付</li>
                                                        <li tabindex="0" role="option" >C. 不可靠</li>
                                    <li tabindex="0" role="option" >D. 不丢失</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】基于&nbsp;TCP/IP&nbsp;的互联网服务中，&nbsp;UDP&nbsp;协议提供无连接不可靠的服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497425" id="question883497425" data="883497425">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">64. <span
											class="colorShallow">(单选题)</span>在下列关于&nbsp;UDP&nbsp;的陈述中，正确的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4b509f3c052e4a5d9247039225f1ce51', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. UDP&nbsp;使用&nbsp;TCP&nbsp;传输协议</li>
                                    <li tabindex="0" role="option" >B. 面向连接的</li>
                                    <li tabindex="0" role="option" >C. 不允许多路复用</li>
                                                        <li tabindex="0" role="option" >D. 其它三种都是错误的</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】UDP&nbsp;协议是一个无连接、不可靠的传输协议，它支持一对一、一对多、多对一和多对多的传输。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497426" id="question883497426" data="883497426">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">65. <span
											class="colorShallow">(单选题)</span>DNS&nbsp;的功能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b2784a61647443869a11d969e111990d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 根据&nbsp;IP&nbsp;地址查询&nbsp;MAC&nbsp;地址</li>
                                                        <li tabindex="0" role="option" >B. 根据域名地址查询&nbsp;IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >C. 根据&nbsp;MAC&nbsp;地址查询&nbsp;IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >D. 根据&nbsp;IP&nbsp;地址查询域名地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】域名解析协议，DNS，即&nbsp;Domain&nbsp;Name&nbsp;Service，用于实现网络设备到&nbsp;IP&nbsp;地址映射的网络服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497427" id="question883497427" data="883497427">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">66. <span
											class="colorShallow">(单选题)</span>Ethernet&nbsp;物理地址长度为&nbsp;48&nbsp;位，允许分配的物理地址应该有（&nbsp; ）个。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1c80f0ed289940129dbea5c3c4095149', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 2⁴⁵</li>
                                    <li tabindex="0" role="option" >B. 2⁴⁶</li>
                                                        <li tabindex="0" role="option" >C. 2⁴⁷</li>
                                    <li tabindex="0" role="option" >D. 2⁴⁸</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】典型的&nbsp;Ethernet物理地址长度为&nbsp;48&nbsp;位（6&nbsp;个字节），允许分配的&nbsp;Ethernet&nbsp;物理地址应该有&nbsp;2⁴⁷&nbsp;个，因为第&nbsp;1&nbsp;字节的最低位为组播标识位，为&nbsp;0&nbsp;时，表示单播，可以分配地址；为&nbsp;1&nbsp;时，表示组播，不能分配地址；因此，可以进行&nbsp;MAC&nbsp;地址分配的位数只有&nbsp;47&nbsp;位。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497428" id="question883497428" data="883497428">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">67. <span
											class="colorShallow">(单选题)</span>路由器在两个网段之间转发数据包时，读取其中的（&nbsp;&nbsp;）地址来确定下一跳的转发路径。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c1153660fecf423aaf4a11006b68ebbc', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 目标&nbsp;IP</li>
                                    <li tabindex="0" role="option" >B. MAC</li>
                                    <li tabindex="0" role="option" >C. 源&nbsp;IP</li>
                                    <li tabindex="0" role="option" >D. ARP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】路由器在两个网段之间转发数据包时，读取其中的目的&nbsp;IP&nbsp;地址来确定下一跳的转发路径。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497429" id="question883497429" data="883497429">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">68. <span
											class="colorShallow">(单选题)</span>以太网采用的媒体接入控制方式为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c2f22bdca5eb47da96236fd0c05fcd74', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. CSMA</li>
                                    <li tabindex="0" role="option" >B. CDMA</li>
                                                        <li tabindex="0" role="option" >C. CSMA/CD</li>
                                    <li tabindex="0" role="option" >D. CSMA/CA</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】以太网采用的媒体接入控制方式为&nbsp;CSMA/CD。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497430" id="question883497430" data="883497430">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">69. <span
											class="colorShallow">(单选题)</span>在&nbsp;IP&nbsp;数据报中，片偏移字段表示本片数据在初始&nbsp;IP&nbsp;数据报数据区的位置。该偏移量以多少字节为单位?（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('aa32c4a3b72440368fcd23943a2ed34e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 2</li>
                                    <li tabindex="0" role="option" >B. 4</li>
                                                        <li tabindex="0" role="option" >C. 8</li>
                                    <li tabindex="0" role="option" >D. 10</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】占&nbsp;13&nbsp;位。片偏移用于指出较长的分组在被分片后，某片在原分组中的相对位置。也就是说，相对用户数据字段的起点，该片从何处开始。片偏移以&nbsp;8&nbsp;字节为偏移单位，即每个分片的长度一定是&nbsp;8&nbsp;字节（64&nbsp;位）的整数倍。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497431" id="question883497431" data="883497431">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">70. <span
											class="colorShallow">(单选题)</span>一个园区网中的三个部门都组建了自己的&nbsp;Ethernet，所有计算机使用的操作系统都相同，现将这三个&nbsp;LAN&nbsp;互连，且每个部门使用不同的网络地址，应选择的互连设备是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('61112b7fa2ae4b599f41ef0e2c779040', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 第二层交换机</li>
                                                        <li tabindex="0" role="option" >B. 路由器</li>
                                    <li tabindex="0" role="option" >C. 集线器</li>
                                    <li tabindex="0" role="option" >D. 网关</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】不同的局域网表示不同的网络，不同网络之间互连的设备是路由器。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497432" id="question883497432" data="883497432">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">71. <span
											class="colorShallow">(单选题)</span>若想访问北京大学（pku）FTP&nbsp;服务器&nbsp;pub&nbsp;目录下的一个文件&nbsp;index.txt，应该在浏览器地址栏内输入（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f193932c7509450dabf585f4da75d9c9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. ftp：//ftp.pku.edu.cn/pub/index.txt</li>
                                    <li tabindex="0" role="option" >B. http：//ftp.pku.edu.cn/pub/index.txt</li>
                                    <li tabindex="0" role="option" >C. ftp：//http.pku.edu.cn/pub/index.txt</li>
                                                        <li tabindex="0" role="option" >D. ftp：//pku.edu.cn/pub/index.txt</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】其&nbsp;URL&nbsp;应该写作&nbsp;ftp：//pku.edu.cn/pub/index.txt。其中&nbsp;ftp&nbsp;指明要访问的服务器为&nbsp;FTP&nbsp;服务器；pku.edu.cn&nbsp;指明要访问的&nbsp;FTP&nbsp;服务器的主机名；pub/index.txt&nbsp;指明要下载的文件名。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497433" id="question883497433" data="883497433">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">72. <span
											class="colorShallow">(单选题)</span>内部网关协议包括（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7bdb4049b2834fbea66cec1a8daf3f57', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. OSPF&nbsp;和&nbsp;IGP</li>
                                    <li tabindex="0" role="option" >B. OSPF&nbsp;和&nbsp;EGP</li>
                                    <li tabindex="0" role="option" >C. RIP&nbsp;和&nbsp;BGP</li>
                                                        <li tabindex="0" role="option" >D. OSPF&nbsp;和&nbsp;RIP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】要区分外部网关协议（EGP）和内部网关协议（IGP），OSPF、RIP&nbsp;属于内部网关协议，BGP&nbsp;则属于外&nbsp;部网关协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497434" id="question883497434" data="883497434">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">73. <span
											class="colorShallow">(单选题)</span>若采用同步&nbsp;TDM，为区分不同数据源的数据，发送端应采取的措施是（&nbsp;&nbsp;），而在接收端则按照与源端相同的时间顺序来接收数据，就可多路复用的信号复原。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('48356ccdb3114946aca8c3f062a72a75', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 各数据源使用固定时间片</li>
                                    <li tabindex="0" role="option" >B. 在数据中加上时间标识</li>
                                    <li tabindex="0" role="option" >C. 各数据源使用随机时间片</li>
                                    <li tabindex="0" role="option" >D. 在数据中加上数据源标识</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】采用同步&nbsp;TDM&nbsp;时，为了区分不同数据源的数据，发送端采取的措施是各数据源使用固定时间片。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497435" id="question883497435" data="883497435">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">74. <span
											class="colorShallow">(单选题)</span>如果某用户希望登录远程服务器，暂时成为远程服务器的一个仿真终端，那么该用户可以使用远程主机提供的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('edc0f42edc9547f4859eb00eca476d97', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. Telnet服务</li>
                                    <li tabindex="0" role="option" >B. E-mail服务</li>
                                    <li tabindex="0" role="option" >C. FTP服务</li>
                                    <li tabindex="0" role="option" >D. DNS服务</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】远程登录是指用户利用&nbsp;Telnet&nbsp;命令使自己的计算机暂时成为远程服务器的一个仿真终端的过程。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497436" id="question883497436" data="883497436">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">75. <span
											class="colorShallow">(单选题)</span>下列关于&nbsp;xDSL&nbsp;技术的描述中，错误的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('16cd8221885c48f5a4aef060047ec393', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. VDSL是非对称传输</li>
                                    <li tabindex="0" role="option" >B. HDSL是对称传输</li>
                                                        <li tabindex="0" role="option" >C. SDSL是非对称传输</li>
                                    <li tabindex="0" role="option" >D. ADSL是非对称传输</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】xDSL&nbsp;技术按上行和下行的速率是否相同可分为对称型和非对称型两种，对称型的有&nbsp;HDSL、SDSL、IDSL，非对称型的有&nbsp;ADSL、VDSL、RADSL。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497437" id="question883497437" data="883497437">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">76. <span
											class="colorShallow">(单选题)</span>局域网的常见网络拓扑结构不包括（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8360a5caba804eeb87202c9b8fa890a5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 网型</li>
                                    <li tabindex="0" role="option" >B. 环型</li>
                                    <li tabindex="0" role="option" >C. 总线型</li>
                                    <li tabindex="0" role="option" >D. 星型</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网的网络拓扑结构主要分为总线型、环型与星型。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497438" id="question883497438" data="883497438">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">77. <span
											class="colorShallow">(单选题)</span>PPP&nbsp;协议使用同步传输技术传送比特串&nbsp;00101111111111010，经过零比特填充后的比特串是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3135c04f30fb47ee8456370995c4fe62', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 0010111110111110010</li>
                                    <li tabindex="0" role="option" >B. 0010111101111101000</li>
                                    <li tabindex="0" role="option" >C. 001011111011111010</li>
                                    <li tabindex="0" role="option" >D. 001011111111110010</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】零比特填充的具体做法是：在发送端，先扫描整个信息字段（通常是用硬件实现，但也可用软件实&nbsp;现，只是会慢些）。只要发现有&nbsp;5&nbsp;个连续&nbsp;1，则立即填入一个&nbsp;0。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497439" id="question883497439" data="883497439">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">78. <span
											class="colorShallow">(单选题)</span>10&nbsp;Gbps&nbsp;Ethernet&nbsp;的应用范围能够从局域网扩展到广域网是因为其物理层采用了（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e97959edff4c4ac78ff53da7b34afd9b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 同轴电缆传输技术</li>
                                                        <li tabindex="0" role="option" >B. 光纤传输技术</li>
                                    <li tabindex="0" role="option" >C. 红外传输技术</li>
                                    <li tabindex="0" role="option" >D. 微波传输技术</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】10&nbsp;Gbps&nbsp;Ethernet&nbsp;在物理层只定义了光纤接口标准，它是为了适应宽带广域网发展的需要而设计的。10&nbsp;Gbps&nbsp;Ethernet&nbsp;的数据传输速率可达&nbsp;10&nbsp;Gbps，因此&nbsp;10&nbsp;Gbps&nbsp;Ethernet&nbsp;的传输介质不再使用传输速率较慢的双绞线和铜线，而只使用光纤。它使用传输距离超过40Km的光收发器和单模光纤接口，以便能在广域网和城域网的范围内工作。也可以使用多模光纤，但相对传输距离有限制。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497440" id="question883497440" data="883497440">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">79. <span
											class="colorShallow">(单选题)</span>B&nbsp;类地址用前&nbsp;16&nbsp;位作为网络号，后&nbsp;16&nbsp;位作为主机号，可用的&nbsp;B&nbsp;类网络个数为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2e38d092d08e4287931673c81a472364', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 2¹⁴&nbsp;-16</li>
                                    <li tabindex="0" role="option" >B. 2¹⁴</li>
                                    <li tabindex="0" role="option" >C. 2¹⁴&nbsp;-17</li>
                                                        <li tabindex="0" role="option" >D. 2¹⁴&nbsp;-18</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】B&nbsp;类地址网络号为&nbsp;16&nbsp;位，但可供使用的为后&nbsp;14&nbsp;位，前两位为标识位，恒定为&nbsp;10。又由于&nbsp;128.0&nbsp;为保留网络地址；B&nbsp;类私有网络&nbsp;172.16~172.31&nbsp;共&nbsp;16&nbsp;个；还有一个&nbsp;169.254&nbsp;作为&nbsp;DHCP&nbsp;服务器的保留网络号。因此，B&nbsp;类地址中，可用的最大网络数为&nbsp;2¹⁴&nbsp;-1&nbsp;-16&nbsp;-1&nbsp;个。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497441" id="question883497441" data="883497441">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">80. <span
											class="colorShallow">(单选题)</span>以下属于网络层协议的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('03952c932cc14ba4b1c4f00a5d8c41fb', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. SMTP</li>
                                    <li tabindex="0" role="option" >B. SLIP</li>
                                                        <li tabindex="0" role="option" >C. ICMP</li>
                                    <li tabindex="0" role="option" >D. DHCP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】ICMP&nbsp;是“互联网&nbsp;Control&nbsp;Message&nbsp;Protocol”（互联网控制消息协议）的缩写。它工作在网络层，&nbsp;是&nbsp;TCP/IP&nbsp;协议族的一个子协议。用于在&nbsp;IP&nbsp;主机与路由器之间传递控制消息。控制消息是指网络是否通畅、主机是否可达、路由是否可用等网络本身的消息。SMTP&nbsp;属于应用层协议，SLIP&nbsp;属于数据链路层协议，DHCP&nbsp;属于应用层协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497442" id="question883497442" data="883497442">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">81. <span
											class="colorShallow">(单选题)</span>由交换机连接的&nbsp;10&nbsp;Mbps&nbsp;的交换式以太网共有&nbsp;10&nbsp;个用户，则每个用户能够占有的带宽为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2440aaf4b25544fe9b4052160d033692', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 1Mbps</li>
                                    <li tabindex="0" role="option" >B. 2Mbps</li>
                                                        <li tabindex="0" role="option" >C. 10Mbps</li>
                                    <li tabindex="0" role="option" >D. 100Mbps</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】交换机每个端口独占带宽。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497443" id="question883497443" data="883497443">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">82. <span
											class="colorShallow">(单选题)</span>在一个&nbsp;TDM&nbsp;中，若在一个周期内为每个&nbsp;9.6&nbsp;Kbps&nbsp;的信号源分配&nbsp;1&nbsp;个时间片，则应为每个&nbsp;19.2&nbsp;Kbps&nbsp;&nbsp;的信号源分配的时间片数（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7e93f381d55847b0b8d8af2230a00c01', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 1/2</li>
                                    <li tabindex="0" role="option" >B. 3</li>
                                    <li tabindex="0" role="option" >C. 1</li>
                                                        <li tabindex="0" role="option" >D. 2</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】19.2/9.6=2，因此，带宽是时间片的&nbsp;2&nbsp;倍，应分配两个时间片。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497444" id="question883497444" data="883497444">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">83. <span
											class="colorShallow">(单选题)</span>IEEE&nbsp;802.3ae&nbsp;的标准速率为&nbsp;10&nbsp;Gbps，那么发送&nbsp;1&nbsp;个比特需要用（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a9d38881f929439cbaddc7d167a6d503', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 1*10⁻⁶s</li>
                                    <li tabindex="0" role="option" >B. 1*10⁻⁸s</li>
                                                        <li tabindex="0" role="option" >C. 1*10⁻¹⁰s</li>
                                    <li tabindex="0" role="option" >D. 1*10⁻¹²s</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】本题考查数据传输速率的计算。数据传输速率是描述数据传输系统的重要技术指标之一。数据传输速率在数值上等于每秒钟传输构成数据代码的二进制比特数，单位为比特/秒（bit/second）&nbsp;，记作&nbsp;bps。对于二进制数据，数据传输速率为：S=1/T（bps）。其中，T&nbsp;为发送每一比特所需要的时间。T=1/S=1b/10Gbps=1*10⁻¹⁰&nbsp;s。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497445" id="question883497445" data="883497445">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">84. <span
											class="colorShallow">(单选题)</span>在&nbsp;MAC&nbsp;子层中，数据传输的基本单元是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('dedcf30815fe45518703d3b372f655aa', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 比特流</li>
                                                        <li tabindex="0" role="option" >B. MAC&nbsp;帧</li>
                                    <li tabindex="0" role="option" >C. LLCPDU</li>
                                    <li tabindex="0" role="option" >D. 数据报</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】因此&nbsp;MAC&nbsp;子层属于链路层，数据传输单元就是&nbsp;MAC&nbsp;帧。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497446" id="question883497446" data="883497446">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">85. <span
											class="colorShallow">(单选题)</span>互联网的所有权属于（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4e0bed90efcc48bca060fc0b37dac91c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 美国国防部高级研究计划管理局（ARPA）</li>
                                                        <li tabindex="0" role="option" >B. 无人拥有</li>
                                    <li tabindex="0" role="option" >C. 各个网络中心</li>
                                    <li tabindex="0" role="option" >D. 互联网执行委员会</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】互联网不属于某个国家或组织，是由互联网协会管理。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497447" id="question883497447" data="883497447">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">86. <span
											class="colorShallow">(单选题)</span>在对&nbsp;IP&nbsp;数据报进行分片时，分片报头与源报文报头可能不相同的字段为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3ca6212d7b1f42b2999b43f54bc20099', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 源IP地址</li>
                                    <li tabindex="0" role="option" >B. 目的IP地址</li>
                                                        <li tabindex="0" role="option" >C. 标志</li>
                                    <li tabindex="0" role="option" >D. 标识</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;IP&nbsp;数据报报头中，源&nbsp;IP&nbsp;地址和目的&nbsp;IP&nbsp;地址分别表示该&nbsp;IP&nbsp;数据报的发送者和接收者的地址，在整个数据报传输过程中，无论经过什么路由，无论如何分片，这两个字段一直保持不变。在&nbsp;IP&nbsp;数据报报头中，标识、标志和片偏移三个字段与控制分片和重组有关。标识是源主机赋予&nbsp;IP&nbsp;数据报的标识符，用于判断分片属于哪个数据报，因此分片时，备分片的标识字段必然与源报文报头完全相同。标志字段是用来告诉目标主机该数据报是否已经分片，是否是最后一个分片。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497448" id="question883497448" data="883497448">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">87. <span
											class="colorShallow">(单选题)</span>局域网互连主要有（&nbsp;&nbsp;）两种形式。<BR>（1）&nbsp;LAN-LAN&nbsp;<BR>（2）&nbsp;LAN-WAN&nbsp;<BR>（3）&nbsp;WAN-WAN&nbsp;<BR>（4）&nbsp;LAN-WAN-LAN
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('645590efd5d84a5c9781939fa785072d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. （1）和（2）</li>
                                                        <li tabindex="0" role="option" >B. （1）和（4）</li>
                                    <li tabindex="0" role="option" >C. （2）和（3）</li>
                                    <li tabindex="0" role="option" >D. （3）和（4）</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网互连主要有局域网与局域网（LAN-LAN）和局域网通过广域网与另一个局域网相连（LAN-WAN-LAN）两种形式。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497449" id="question883497449" data="883497449">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">88. <span
											class="colorShallow">(单选题)</span>收到的分组一定是按序接收的协议是（&nbsp;&nbsp;）。<br>Ⅰ.停止-等待协议<br>Ⅱ.回退&nbsp;N&nbsp;协议<br>Ⅲ.选择重传协议
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fe545cf28a7b4b729de59abe0667c49a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. Ⅰ、Ⅱ</li>
                                    <li tabindex="0" role="option" >B. Ⅰ、Ⅲ</li>
                                    <li tabindex="0" role="option" >C. Ⅱ、Ⅲ</li>
                                    <li tabindex="0" role="option" >D. 都有可能</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i><p>【解析】要使分组一定是按序接收的，接收窗口的大小为&nbsp;1&nbsp;才能满足，只有停止-等待协议与回退&nbsp;N&nbsp;协议的接收窗口大小为&nbsp;1。</p></div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497450" id="question883497450" data="883497450">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">89. <span
											class="colorShallow">(单选题)</span>以下路由选择协议中，不属于在自治系统内部使用的路由选择协议是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('adfac17b0bbe47dba7b4881384a6b385', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. BGP</li>
                                    <li tabindex="0" role="option" >B. RIP</li>
                                    <li tabindex="0" role="option" >C. IGP</li>
                                    <li tabindex="0" role="option" >D. OSPF</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】边界网关协议（Border&nbsp;Gateway&nbsp;Protocol，BGP），属于外部网关协议，是在两个自治系统之间使用的路由选择协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497451" id="question883497451" data="883497451">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">90. <span
											class="colorShallow">(单选题)</span>应用程序&nbsp;PING&nbsp;发出的是（&nbsp;&nbsp;）&nbsp;报文。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('71629fb59ae94508938f7eddd220a7f7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. TCP&nbsp;请求报文</li>
                                    <li tabindex="0" role="option" >B. TCP&nbsp;应答报文</li>
                                                        <li tabindex="0" role="option" >C. ICMP&nbsp;请求报文</li>
                                    <li tabindex="0" role="option" >D. ICMP&nbsp;应答报文</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】应用程序&nbsp;PING&nbsp;发出的是&nbsp;ICMP&nbsp;请求报文。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497452" id="question883497452" data="883497452">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">91. <span
											class="colorShallow">(单选题)</span>下列的应用层协议中，（&nbsp;&nbsp;）是采用&nbsp;UDP&nbsp;传输的。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('749a694bea72443d8e7404f7e189c902', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. SMTP</li>
                                                        <li tabindex="0" role="option" >B. RIP</li>
                                    <li tabindex="0" role="option" >C. TELNET</li>
                                    <li tabindex="0" role="option" >D. FTP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】DNS、TFTP、RIP、DHCP、SNMP、IGMP&nbsp;和&nbsp;NFS&nbsp;等协议是采用&nbsp;UDP&nbsp;传输的，而&nbsp;SMTP、HTTP、FTP&nbsp;和&nbsp;TELNET&nbsp;等协议都使用&nbsp;TCP&nbsp;来传输。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497453" id="question883497453" data="883497453">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">92. <span
											class="colorShallow">(单选题)</span>主机&nbsp;A&nbsp;向主机&nbsp;B&nbsp;发送一个（SYN=1，seq=11220）的&nbsp;TCP&nbsp;报文，期望与主机&nbsp;B&nbsp;建立&nbsp;TCP&nbsp;连接，若主机&nbsp;B&nbsp;收到接受该连接请求，则主机&nbsp;B&nbsp;向主机&nbsp;A&nbsp;发送正确的&nbsp;TCP&nbsp;报文段可能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2cfd1efa5b5845ec9f446ec75165cf4e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. （SYN=0，ACK=0，seq=11221，ack=11221）</li>
                                    <li tabindex="0" role="option" >B. （SYN=1，ACK=1，seq=11220，ack=11220）</li>
                                                        <li tabindex="0" role="option" >C. （SYN=1，ACK=1，seq=11221，ack=11221）</li>
                                    <li tabindex="0" role="option" >D. （SYN=0，ACK=0，seq=11220，ack=11220）</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】主机&nbsp;A&nbsp;向主机&nbsp;B&nbsp;发送一个（SYN=1，seq=11220）的&nbsp;TCP&nbsp;报文，期望与主机&nbsp;B&nbsp;建立&nbsp;TCP&nbsp;连接，若主机&nbsp;B&nbsp;收到接受该连接请求，则主机&nbsp;B&nbsp;向主机&nbsp;A&nbsp;发送正确的&nbsp;TCP&nbsp;报文段可能是同意建立连接，此时，SYN=1，ACK=1，ack&gt;11220。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497454" id="question883497454" data="883497454">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">93. <span
											class="colorShallow">(单选题)</span>ADSL&nbsp;上行速率范围是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('ca8f677ead8f4f7ca001e1e69ea4c4ab', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 64Kbps～640Kbps</li>
                                    <li tabindex="0" role="option" >B. 640Kbps～7Mbps</li>
                                    <li tabindex="0" role="option" >C. 7Mbps～10Mbps</li>
                                    <li tabindex="0" role="option" >D. 10Mbps～20Mbps</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i><p>【解析】ADSL(Asymmetric&nbsp;Digital&nbsp;Subsciber&nbsp;Line，非对称数字用户线)上行速率范围是&nbsp;64&nbsp;Kbps～640&nbsp;Kbps，下行速率范围是&nbsp;1.5&nbsp;Mbps～6&nbsp;Mbps。</p></div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497455" id="question883497455" data="883497455">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">94. <span
											class="colorShallow">(单选题)</span>采用&nbsp;CSMA/CD&nbsp;通信协议的网络称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('533df31642d944348a37ae073e691f96', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 万维网</li>
                                    <li tabindex="0" role="option" >B. 互联网</li>
                                                        <li tabindex="0" role="option" >C. 以太网</li>
                                    <li tabindex="0" role="option" >D. 广域网</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目前被普遍采用并形成国际标准的局域网介质访问控制方法主要有以下三种：带有冲突检测的载波侦听多路访问（CSMA/CD）方法、令牌总线（令牌总线）方法、令牌环（令牌环）方法。以太网的介质访问控制方法是&nbsp;CSMA/CD。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497456" id="question883497456" data="883497456">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">95. <span
											class="colorShallow">(单选题)</span>以下给出的协议中，属于&nbsp;TCP/IP&nbsp;结构的应用层是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('9f18513b547945fe9bd55735b6f6c10d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. UDP</li>
                                    <li tabindex="0" role="option" >B. IP</li>
                                    <li tabindex="0" role="option" >C. TCP</li>
                                                        <li tabindex="0" role="option" >D. Telnet</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】应用层常用的协议有&nbsp;DNS、FTP、TFTP、TELNET、HTTP、SMTP&nbsp;和&nbsp;SNMP&nbsp;等。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497457" id="question883497457" data="883497457">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">96. <span
											class="colorShallow">(单选题)</span>在“http：//www.njzk.edu.cn/index.htm”中，“index.htm”代表（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6a67949932a341e6b62429059b8834a1', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 协议类型</li>
                                    <li tabindex="0" role="option" >B. 主机名</li>
                                                        <li tabindex="0" role="option" >C. 路径及文件名</li>
                                    <li tabindex="0" role="option" >D. 其它三种都不对</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;UR&nbsp;L中，“http：”表示协议类型，“www.njzk.edu.cn”表示主机名，“index.htm”表示路径及文件名。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497458" id="question883497458" data="883497458">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">97. <span
											class="colorShallow">(单选题)</span>下列网络连接设备都工作在数据链路层的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0e71445a504a43cf994343208bb2a8bc', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 中继器和集线器</li>
                                    <li tabindex="0" role="option" >B. 集线器和网桥</li>
                                                        <li tabindex="0" role="option" >C. 网桥和局域网交换机</li>
                                    <li tabindex="0" role="option" >D. 集线器和局域网交换机</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】中继器和集线器属于物理层设备，网桥和局域网交换机属于数据链路层设备。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497459" id="question883497459" data="883497459">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">98. <span
											class="colorShallow">(单选题)</span>在&nbsp;Internet&nbsp;上，大学或教育机构类别的域名中一般包括（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d6f8a8d333844af6b7caeb296b7f8a19', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. edu</li>
                                    <li tabindex="0" role="option" >B. com</li>
                                    <li tabindex="0" role="option" >C. gov</li>
                                    <li tabindex="0" role="option" >D. org</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】域名中的“.edu”表示教育机构。表示商业组织一般用“.com'’，表示政府部门一般用“.gov”，表示国际组织一般用“.org”。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497460" id="question883497460" data="883497460">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">99. <span
											class="colorShallow">(单选题)</span>DNS&nbsp;客户端应用的端口号可能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('9e0df3ebbdee4bcda54380580d9b8885', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 53</li>
                                    <li tabindex="0" role="option" >B. 23</li>
                                    <li tabindex="0" role="option" >C. 8080</li>
                                                        <li tabindex="0" role="option" >D. 49152</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】任何客户端应用的端口号中能是短暂（临时）端口号。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497461" id="question883497461" data="883497461">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">100. <span
											class="colorShallow">(单选题)</span>设某路由器建立了如下路由表：<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一跳<BR>192.4.153.0/26&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₃<BR>128.96.39.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m0<BR>128.96.39.128/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m1<BR>128.96.40.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₂<BR>*（默认）&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₄<BR>现收到目的&nbsp;IP&nbsp;地址&nbsp;128.96.40.153，其下一跳是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('84d3ba8a165e4119a6f8953dd8a61172', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 接口&nbsp;m0</li>
                                    <li tabindex="0" role="option" >B. 接口&nbsp;m1</li>
                                    <li tabindex="0" role="option" >C. R₂</li>
                                                        <li tabindex="0" role="option" >D. R₄</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目的&nbsp;IP&nbsp;地址&nbsp;128.96.40.153&nbsp;与子网掩码&nbsp;255.255.255.128&nbsp;相与后得&nbsp;128.96.40.128&nbsp;，与子网掩码&nbsp;255.255.255.192&nbsp;相与后得&nbsp;128.96.40.128，经查路由表知，该分组转发选择默认路由，经&nbsp;R₄&nbsp;转发。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497462" id="question883497462" data="883497462">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">101. <span
											class="colorShallow">(单选题)</span>网络协议主要由&nbsp;3&nbsp;个基本要素组成，即（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d2660d3ec33a447cbba63a51d5092345', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 层次、语义和同步</li>
                                    <li tabindex="0" role="option" >B. 语法、原语和同步</li>
                                                        <li tabindex="0" role="option" >C. 语法、语义和同步</li>
                                    <li tabindex="0" role="option" >D. 语法、语义和功能</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络协议主要由以下三个要素组成：
<br>1、语法：用户数据与控制信息的结构与格式。
<br>2、语义：需要发出何种控制信息，以及完成的动作与做出的响应。
<br>3、同步：对事件实现顺序的详细说明。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497463" id="question883497463" data="883497463">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">102. <span
											class="colorShallow">(单选题)</span>局域网数据传输具有高传输率、低误码率的特点，典型的以太网数据传输速率可以从&nbsp;10&nbsp;Mbps&nbsp;到（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('11c9717cc91744b8890fd3466096d6fa', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 100Mbps</li>
                                    <li tabindex="0" role="option" >B. 644Mbps</li>
                                    <li tabindex="0" role="option" >C. 1000Mbps</li>
                                                        <li tabindex="0" role="option" >D. 10000Mbps</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目前在传输速率为&nbsp;10&nbsp;Mbps&nbsp;的以太网广泛应用的基础上，速率为&nbsp;100&nbsp;Mbps&nbsp;与&nbsp;10&nbsp;Gbps&nbsp;的高速以太网已进入实用阶段，10&nbsp;Gbps&nbsp;以太网的物理层使用的是光纤通道技术。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497464" id="question883497464" data="883497464">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">103. <span
											class="colorShallow">(单选题)</span>在路由表中&nbsp;0.0.0.0&nbsp;代表（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c7f32cca954c4fa2a956ccc20df0d4c9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 静态路由</li>
                                    <li tabindex="0" role="option" >B. 动态路由</li>
                                                        <li tabindex="0" role="option" >C. 默认路由</li>
                                    <li tabindex="0" role="option" >D. RIP&nbsp;路由</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在路由表中&nbsp;0.0.0.0&nbsp;代表默认路由。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497465" id="question883497465" data="883497465">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">104. <span
											class="colorShallow">(单选题)</span>设&nbsp;TCP&nbsp;的&nbsp;ssthresh&nbsp;的初始值为&nbsp;8（单位为报文段）。当拥塞窗口上升到&nbsp;12&nbsp;时网络发生了超时，请问这是第（&nbsp;&nbsp;）次传输。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c034acbda7a24c218fffa23e8947cf87', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 10</li>
                                    <li tabindex="0" role="option" >B. 9</li>
                                                        <li tabindex="0" role="option" >C. 8</li>
                                    <li tabindex="0" role="option" >D. 7</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】传输次数与拥塞窗口大小的关系如下：
<br>传输次数&nbsp;&nbsp;&nbsp;拥塞窗口大小
<br>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1
<br>2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2
<br>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4
<br>4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8
<br>5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9
<br>6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10
<br>7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11
<br>8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;12</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497466" id="question883497466" data="883497466">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">105. <span
											class="colorShallow">(单选题)</span>两台交换机分别具有&nbsp;12&nbsp;个和&nbsp;16&nbsp;个&nbsp;10/100&nbsp;Mbps&nbsp;全双工下联端口，它们的上联端口带宽至少应为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8abc2fe2d78c473e928bb0e02156becc', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 0.6Gbps和0.8Gbps</li>
                                    <li tabindex="0" role="option" >B. 1.2Gbps和1.6Gbps</li>
                                                        <li tabindex="0" role="option" >C. 2.4Gbps和3.2Gbps</li>
                                    <li tabindex="0" role="option" >D. 4.8Gbps和6.4Gbps</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】全双工端口带宽的计算方法是：端口数*端口速率*2。
<br>具有&nbsp;12&nbsp;个&nbsp;10/100&nbsp;Mbps&nbsp;全双工端口最大带宽是&nbsp;12*100*2=2400&nbsp;Mbps=2.4&nbsp;Gbps
<br>具有&nbsp;16&nbsp;个&nbsp;10/100&nbsp;Mbps&nbsp;全双工端口最大带宽是&nbsp;16*100*2=3200&nbsp;Mbps=3.2&nbsp;Gbps。
<br>上联端口带宽是交换机所有端口带宽的总和。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497467" id="question883497467" data="883497467">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">106. <span
											class="colorShallow">(单选题)</span>DNS&nbsp;是用来解析下列各项中的哪一项？（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('113c60fefc4b43f69315572f9f98a116', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IP&nbsp;地址和&nbsp;MAC&nbsp;地址</li>
                                                        <li tabindex="0" role="option" >B. 主机名和&nbsp;IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >C. TCP&nbsp;名字和地址</li>
                                    <li tabindex="0" role="option" >D. 主机名和运输层地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】域名解析协议，DNS，即&nbsp;Domain&nbsp;Name&nbsp;Service，用于实现网络设备到&nbsp;IP&nbsp;地址映射的网络服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497468" id="question883497468" data="883497468">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">107. <span
											class="colorShallow">(单选题)</span>地址块&nbsp;10/8，则可由用户分配的子网号与主机号的总长度为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('60f2fca76ccb44b8b1c55878d57af429', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 8位</li>
                                    <li tabindex="0" role="option" >B. 16位</li>
                                                        <li tabindex="0" role="option" >C. 24位</li>
                                    <li tabindex="0" role="option" >D. 32位</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】地址块&nbsp;10/8&nbsp;的主机号占&nbsp;32-8=24&nbsp;位。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497469" id="question883497469" data="883497469">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">108. <span
											class="colorShallow">(单选题)</span>FTP&nbsp;服务器负责管理一个文件仓库，用户通过自己的计算机从文件仓库中取文件的过程叫（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6e8b22af5b444ea597aac627771cd431', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 上传</li>
                                                        <li tabindex="0" role="option" >B. 下载</li>
                                    <li tabindex="0" role="option" >C. 交换</li>
                                    <li tabindex="0" role="option" >D. 上载</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】FTP&nbsp;服务器负责管理一个文件仓库，用户通过&nbsp;FTP&nbsp;客户机从文件仓库中取文件或向文件仓库存入文件。将文件从服务器传到客户机称为下载文件，将文件从客户机传到服务器称为上传文件。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497470" id="question883497470" data="883497470">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">109. <span
											class="colorShallow">(单选题)</span>建立计算机网络的主要目的是实现计算机资源的共享。计算机资源主要指计算机的（&nbsp;&nbsp;）。<BR>Ⅰ．硬件、软件<BR>Ⅱ．Web&nbsp;服务器、数据库服务器<BR>Ⅲ．数据<BR>Ⅳ．网络操作系统
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7f1c6106d1bd4106937042f2dd1b5804', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. Ⅰ和Ⅱ</li>
                                    <li tabindex="0" role="option" >B. Ⅱ和Ⅳ</li>
                                    <li tabindex="0" role="option" >C. Ⅰ、Ⅱ和Ⅳ</li>
                                                        <li tabindex="0" role="option" >D. Ⅰ和Ⅲ</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】计算机资源主要指计算机硬件、软件与数据。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497471" id="question883497471" data="883497471">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">110. <span
											class="colorShallow">(单选题)</span>C&nbsp;类地址用前&nbsp;24&nbsp;位作为网络号，后&nbsp;8&nbsp;位作为主机号，可用的&nbsp;C&nbsp;类网络个数为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b01b00495d9f44958b5de88888896af3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 2²⁴</li>
                                                        <li tabindex="0" role="option" >B. 2²¹&nbsp;-257</li>
                                    <li tabindex="0" role="option" >C. 2²¹&nbsp;-256</li>
                                    <li tabindex="0" role="option" >D. 2²⁴&nbsp;-256</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】C&nbsp;类地址网络号为&nbsp;24&nbsp;位，但可供使用的为后&nbsp;21&nbsp;位，前三位为标识位，恒定为&nbsp;110。又由于&nbsp;192.0.0&nbsp;为保留网络地址；C&nbsp;类私有网络&nbsp;192.168.0~192.168.255&nbsp;共&nbsp;256&nbsp;个。因此，C&nbsp;类地址中，可用的最大网络数为&nbsp;2²¹&nbsp;-1&nbsp;-256&nbsp;个。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497472" id="question883497472" data="883497472">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">111. <span
											class="colorShallow">(单选题)</span>UDP&nbsp;报文中，伪首部的作用是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fdb9789b2aa943c5a73103f96c3f9a8b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 数据对齐</li>
                                                        <li tabindex="0" role="option" >B. 计算校验和</li>
                                    <li tabindex="0" role="option" >C. 数据加密</li>
                                    <li tabindex="0" role="option" >D. 数据填充</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】UDP&nbsp;伪首部的功能是计算校验和。UDP&nbsp;是一种无连接的协议，不需要在数据传输之前建立连接，也不需要在数据传输之后释放连接。在使用&nbsp;UDP&nbsp;协议进行通信时，在数据发送方，UDP&nbsp;传输实体将用户数据加上&nbsp;UDP&nbsp;数据报头部（包括构造伪首部与计算校验和的过程），形成&nbsp;UDP&nbsp;用户数据报。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497473" id="question883497473" data="883497473">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">112. <span
											class="colorShallow">(单选题)</span>关于外部网关协议&nbsp;BGP，以下选项中不正确的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4a3824873d8341159fd5c62e9a76969c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. BGP是一种距离矢量协议</li>
                                                        <li tabindex="0" role="option" >B. 封装在IP数据报中传送</li>
                                    <li tabindex="0" role="option" >C. 能够检测路由循环</li>
                                    <li tabindex="0" role="option" >D. 支持路由汇聚功能</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】BGP&nbsp;协议是通过&nbsp;TCP&nbsp;连接来与邻站进行通信，因此邻站的通信必须封装为&nbsp;TCP&nbsp;报文才能与邻站通信。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497474" id="question883497474" data="883497474">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">113. <span
											class="colorShallow">(单选题)</span>千兆以太网的传输速率是传统的&nbsp;10&nbsp;Mbps&nbsp;以太网的&nbsp;100&nbsp;倍，但是它仍然保留着和传统的以太网相同的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a75f7e48ac5f420aa8a752f7dfb05463', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 网卡</li>
                                    <li tabindex="0" role="option" >B. 集线器</li>
                                                        <li tabindex="0" role="option" >C. 帧格式</li>
                                    <li tabindex="0" role="option" >D. 物理层协议</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】千兆以太网的传输速率是传统的&nbsp;10&nbsp;Mbps&nbsp;以太网的&nbsp;100&nbsp;倍，但是它仍然保留着和传统的以太网相同的帧格式。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497475" id="question883497475" data="883497475">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">114. <span
											class="colorShallow">(单选题)</span>以下没有采用存储转发技术的交换技术是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('db3a68e2da4a41568bf2fca83b78a0de', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 电路交换</li>
                                    <li tabindex="0" role="option" >B. 报文交换</li>
                                    <li tabindex="0" role="option" >C. 分组交换</li>
                                    <li tabindex="0" role="option" >D. 信元交换</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】“电路交换”又称为“线路交换”，是一种面向连接的服务。电路交换没有采用存储转发机制，而报&nbsp;文交换和分组交换则采用了存储转发机制。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497476" id="question883497476" data="883497476">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">115. <span
											class="colorShallow">(单选题)</span>由于利用&nbsp;IP&nbsp;进行互联的各个物理网络所能处理的最大报文长度可能不同，所以&nbsp;IP&nbsp;报文在传输和投递过程中有可能被（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bd82cfc1397a4777b2c16e895715d44a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 分片</li>
                                    <li tabindex="0" role="option" >B. 丢弃</li>
                                    <li tabindex="0" role="option" >C. 重组</li>
                                    <li tabindex="0" role="option" >D. 转换</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由于利用&nbsp;IP&nbsp;进行互联的各个物理网络所能处理的最大报文长度可能不同，所以&nbsp;IP&nbsp;报文在传输和投递过程中有可能被分片。IP&nbsp;数据报使用标示、标志和片偏移三个域对分片进行控制，分片后的报文将在目的主机进行重组。由于分片后的报文独立地选择路径传送，因此报文在投递过程中不会也不可能重组。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497477" id="question883497477" data="883497477">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">116. <span
											class="colorShallow">(单选题)</span>具有拓扑中心的网络结构是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1760232c6827437c97f49687685714bd', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 网状拓扑</li>
                                    <li tabindex="0" role="option" >B. 树状拓扑</li>
                                    <li tabindex="0" role="option" >C. 环形拓扑</li>
                                                        <li tabindex="0" role="option" >D. 星形拓扑</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】星形网络具有拓扑中心。树形网络有最高层结点，或者头结点，但不是拓扑中心。网状结构和环形结构的网络，网络中的结点都是平等的，没有拓扑中心。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497478" id="question883497478" data="883497478">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">117. <span
											class="colorShallow">(单选题)</span>PPP&nbsp;协议用在&nbsp;SONET/SDH&nbsp;链路时，采用零比特填充法透明传输比特串“01111111111001”，则比特填充后的输出为（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('9fcf8452217c4bfa87a1d65db54a7780', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 0111110111110001</li>
                                    <li tabindex="0" role="option" >B. 011111011111001</li>
                                    <li tabindex="0" role="option" >C. 0111111&nbsp;1111001</li>
                                    <li tabindex="0" role="option" >D. 01111111111001</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】零比特填充的具体做法是：在发送端，先扫描整个信息字段（通常是用硬件实现，但也可用软件实&nbsp;现，只是会慢些）。只要发现有&nbsp;5&nbsp;个连续&nbsp;1，则立即填入一个&nbsp;0。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497479" id="question883497479" data="883497479">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">118. <span
											class="colorShallow">(单选题)</span>IP&nbsp;地址格式分为几部分?&nbsp;（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4d43d858e7c84b82a4a8a56eb107aa3f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 2</li>
                                    <li tabindex="0" role="option" >B. 4</li>
                                    <li tabindex="0" role="option" >C. 5</li>
                                    <li tabindex="0" role="option" >D. 6</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查&nbsp;IP&nbsp;地址格式。
<br>[解题要点]&nbsp;划分为网络号与主机号两部分。
<br>[考点链接]&nbsp;具有相同网络号属于同一逻辑网络。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497480" id="question883497480" data="883497480">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">119. <span
											class="colorShallow">(单选题)</span>TCP/IP&nbsp;体系结构中，IP&nbsp;和&nbsp;TCP&nbsp;分别为（&nbsp;&nbsp;）提供服务。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d1248a19eed04b0195e17e84a85d0254', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 数据链路层和网络层</li>
                                    <li tabindex="0" role="option" >B. 网络层和运输层</li>
                                                        <li tabindex="0" role="option" >C. 运输层和应用层</li>
                                    <li tabindex="0" role="option" >D. 运输层和网络层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】下层的目的是向上一层提供服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497481" id="question883497481" data="883497481">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">120. <span
											class="colorShallow">(单选题)</span>以下不是决定局域网特性的主要技术要素是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('712098f878ac4ec290657ec7051e2947', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 网络拓扑</li>
                                                        <li tabindex="0" role="option" >B. 网络应用</li>
                                    <li tabindex="0" role="option" >C. 传输介质</li>
                                    <li tabindex="0" role="option" >D. 介质访问控制方法</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】决定局域网特性的主要技术要素是网络拓扑、传输介质与介质访问控制方法。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497482" id="question883497482" data="883497482">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">121. <span
											class="colorShallow">(单选题)</span>一旦中心结点出现故障，就会造成全网瘫痪的拓扑结构是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7d19d1a0bbf14f5db92086b217caafca', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 星型结构</li>
                                    <li tabindex="0" role="option" >B. 树型结构</li>
                                    <li tabindex="0" role="option" >C. 网型结构</li>
                                    <li tabindex="0" role="option" >D. 环型结构</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】具有中心结点的结构叫做星型结构。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497483" id="question883497483" data="883497483">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">122. <span
											class="colorShallow">(单选题)</span>在&nbsp;VLAN&nbsp;的划分中，不能按照以下哪种方法定义其成员（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('116afdfba44941b49ca898c581a16eaa', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 交换机端口</li>
                                    <li tabindex="0" role="option" >B. MAC地址</li>
                                                        <li tabindex="0" role="option" >C. 操作系统类型</li>
                                    <li tabindex="0" role="option" >D. IP地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】虚拟局域网。
<br>[评析]&nbsp;VLAN（Virtual&nbsp;Local&nbsp;Area&nbsp;Network）又称虚拟局域网，虚拟局域网成员定义方法通常有四种：用交换机端口号定义虚拟局域网、用&nbsp;MAC&nbsp;地址定义虚拟局域网、用网络层地址定义虚拟局域网、IP&nbsp;广播组虚拟局域网。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497484" id="question883497484" data="883497484">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">123. <span
											class="colorShallow">(单选题)</span>关于&nbsp;IPv4&nbsp;地址与&nbsp;IPv6&nbsp;地址的描述中，正确的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('43fdcf1c7e724735b8342aad1e773fdd', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IPv4地址和IPv6地址都为32位</li>
                                                        <li tabindex="0" role="option" >B. IPv4地址为32位，IPv6地址为128位</li>
                                    <li tabindex="0" role="option" >C. IPv4地址和IPv6地址都为128位</li>
                                    <li tabindex="0" role="option" >D. IPv4地址为128位，IPv6地址为32位</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IPv6&nbsp;采用&nbsp;128&nbsp;位地址长度，IPv4&nbsp;采用&nbsp;32&nbsp;为地址长度。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497485" id="question883497485" data="883497485">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">124. <span
											class="colorShallow">(单选题)</span>一个&nbsp;/8&nbsp;的地址块，划分为&nbsp;250&nbsp;个大小相同的子网，其最短的子网掩码为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e18118db9a284b9e8516b228f375168f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 255.248.0.0</li>
                                    <li tabindex="0" role="option" >B. 255.252.0.0</li>
                                    <li tabindex="0" role="option" >C. 255.254.0.0</li>
                                                        <li tabindex="0" role="option" >D. 255.255.0.0</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】设要达到所需的子网数，所需的子网位数为&nbsp;n
<br>则只须&nbsp;2ⁿ&nbsp;大于等于如下所要求的子网数时，就满足要求
<br>要求子网数为&nbsp;250&nbsp;时，2ⁿ&nbsp;≥&nbsp;250，可得&nbsp;n&nbsp;的最小值为&nbsp;8，掩码长度为&nbsp;8+8=16，其掩码应为：255.255.0.0。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497486" id="question883497486" data="883497486">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">125. <span
											class="colorShallow">(单选题)</span>访问&nbsp;WWW&nbsp;服务器所使用的客户端应用程序是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3403d2e03aee4c70a84bd42b6998eb01', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 浏览器</li>
                                    <li tabindex="0" role="option" >B. 搜索引擎</li>
                                    <li tabindex="0" role="option" >C. Outlook</li>
                                    <li tabindex="0" role="option" >D. URL</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】访问&nbsp;WWW&nbsp;服务器所使用的客户端应用程序一般是代理服务程序浏览器。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497487" id="question883497487" data="883497487">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">126. <span
											class="colorShallow">(单选题)</span>高层协议利用&nbsp;TCP&nbsp;协议提供的（&nbsp;&nbsp;）与目的进程建立连接。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('505bcb688b0c46f0b38bfd1689cba913', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >B. MAC&nbsp;地址</li>
                                    <li tabindex="0" role="option" >C. 逻辑地址</li>
                                                        <li tabindex="0" role="option" >D. 端口号</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】高层协议利用&nbsp;TCP&nbsp;协议提供的端口号与目的进程建立连接。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497488" id="question883497488" data="883497488">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">127. <span
											class="colorShallow">(单选题)</span>数据链路层可以通过（&nbsp;&nbsp;）标识不同的主机。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('842eff95e0b24d3893ea9e9df2364738', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 物理地址</li>
                                    <li tabindex="0" role="option" >B. 端口号</li>
                                    <li tabindex="0" role="option" >C. IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >D. 逻辑地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据链路层可以通过物理地址（MAC）标识不同的主机。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497489" id="question883497489" data="883497489">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">128. <span
											class="colorShallow">(单选题)</span>网关是运行在&nbsp;ISO&nbsp;参考模型哪一层的互连中继设备？（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cf018869dc4c4d6595dcbc0e849074a9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 网络层</li>
                                    <li tabindex="0" role="option" >B. 低三层</li>
                                                        <li tabindex="0" role="option" >C. 高层</li>
                                    <li tabindex="0" role="option" >D. 数据链路层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网关是网络进行高层互连的设备，运行在&nbsp;ISO&nbsp;参考模型中网络层以上的高层。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497490" id="question883497490" data="883497490">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">129. <span
											class="colorShallow">(单选题)</span>HFC&nbsp;利用（&nbsp;&nbsp;）接入互联网。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f132c4f11c584a67b17bc1381c8d7eee', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 有线电话网</li>
                                                        <li tabindex="0" role="option" >B. 有线电视网</li>
                                    <li tabindex="0" role="option" >C. 移动电话网</li>
                                    <li tabindex="0" role="option" >D. 无线局域网</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】HFC&nbsp;利用有线电视网络接入互联网。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497491" id="question883497491" data="883497491">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">130. <span
											class="colorShallow">(单选题)</span>TCP/IP&nbsp;协议是&nbsp;Internet&nbsp;中计算机之间通信所必须共同遵循的一种（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4800109c4b944a9487766ac603da44bf', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 信息资源</li>
                                                        <li tabindex="0" role="option" >B. 通信规定</li>
                                    <li tabindex="0" role="option" >C. 软件</li>
                                    <li tabindex="0" role="option" >D. 硬件</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;协议是&nbsp;Internet&nbsp;中计算机之间通信所必须共同遵循的一种通信规则。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497492" id="question883497492" data="883497492">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">131. <span
											class="colorShallow">(单选题)</span>互联网常用的主要工作模式是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d139cefd7f44411797ff6b4e2f3bcfea', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 对等模式</li>
                                                        <li tabindex="0" role="option" >B. 客户机/服务器模式</li>
                                    <li tabindex="0" role="option" >C. 星型</li>
                                    <li tabindex="0" role="option" >D. 总线型</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】计算机网络主要有两种工作模式：对等模式和客户机/服务器模式。客户机/服务器模式是指在网中的计算机有主从之分，有的计算机作为服务器，而其他计算机则为客户机（或称工作站）。通常是客户机提出请求，服务器为之服务。客户机也可以像单机一样地工作。客户机/服务器模式是互联网&nbsp;常用的主要工作模式。互联网提供的各种服务都是这种模式，而星型、总线型指的是拓扑结构。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497493" id="question883497493" data="883497493">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">132. <span
											class="colorShallow">(单选题)</span>设某路由器建立了如下路由表：<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一跳<BR>192.4.153.0/26&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₃<BR>128.96.39.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m0<BR>128.96.39.128/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m1<BR>128.96.40.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₂<BR>*（默认）&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₄<BR>现收到目的&nbsp;IP&nbsp;地址&nbsp;128.96.40.20，其下一跳是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cd6bce7aa58d4bbe803ee059d57fac75', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 接口&nbsp;m0</li>
                                    <li tabindex="0" role="option" >B. 接口&nbsp;m1</li>
                                                        <li tabindex="0" role="option" >C. R₂</li>
                                    <li tabindex="0" role="option" >D. R₄</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目的&nbsp;IP&nbsp;地址&nbsp;128.96.40.20&nbsp;与子网掩码&nbsp;255.255.255.128&nbsp;相与得&nbsp;128.96.40.0.不等于&nbsp;128.96.39.0。与子网掩码&nbsp;255.255.255.128&nbsp;相与得&nbsp;128.96.40.0，经查路由表可知，该项分组经&nbsp;R₂&nbsp;转发。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497494" id="question883497494" data="883497494">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">133. <span
											class="colorShallow">(单选题)</span>10&nbsp;Base-5&nbsp;型&nbsp;LAN&nbsp;的运行速度和支持的粗缆最大长度是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e8c3231502f743ff83f9c8d0547539c3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 10Mbps，100m</li>
                                    <li tabindex="0" role="option" >B. 10Mbps，200m</li>
                                                        <li tabindex="0" role="option" >C. 10Mbps，500m</li>
                                    <li tabindex="0" role="option" >D. 16Mbps，500m</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】10&nbsp;Base-5&nbsp;型&nbsp;LAN&nbsp;的特性。
<br>[评析]&nbsp;10&nbsp;Base-5&nbsp;中&nbsp;10&nbsp;表示数据速率&nbsp;10&nbsp;Mbps，Base&nbsp;是指基带传输，500&nbsp;m&nbsp;是最大传输距离。10&nbsp;Base-5&nbsp;网络使用&nbsp;RG-8&nbsp;电缆和夹紧端子。夹紧端子可直接固定到电缆中，电缆连接成直线型总线，以提供&nbsp;100&nbsp;Mbps&nbsp;的可能传输速率。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497495" id="question883497495" data="883497495">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">134. <span
											class="colorShallow">(单选题)</span>千兆以太网的标准是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4e31a28ed77a42be98c208225f8921b3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IEEE&nbsp;802.3ae</li>
                                                        <li tabindex="0" role="option" >B. IEEE&nbsp;802.3z</li>
                                    <li tabindex="0" role="option" >C. IEEE&nbsp;802.3az</li>
                                    <li tabindex="0" role="option" >D. IEEE&nbsp;802.3ab</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】千兆以太网的标准是&nbsp;IEEE&nbsp;802.3z。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497496" id="question883497496" data="883497496">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">135. <span
											class="colorShallow">(单选题)</span>己知主机&nbsp;A&nbsp;要向主机&nbsp;B&nbsp;发送&nbsp;3&nbsp;KB&nbsp;的数据。在&nbsp;TCP&nbsp;连接建立后，A&nbsp;的发送窗口大小是&nbsp;2&nbsp;KB，A&nbsp;的初始序号是&nbsp;0。A&nbsp;发送&nbsp;1&nbsp;KB&nbsp;的数据，接着&nbsp;A&nbsp;就一直发送数据，直到把发送窗口用完。这时发送方&nbsp;A&nbsp;收到对第&nbsp;1000&nbsp;号字节的确认报文段。发送窗口中数据的最小序号是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f7d12c03758e424bbc6269b099039ea9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 1000</li>
                                                        <li tabindex="0" role="option" >B. 1001</li>
                                    <li tabindex="0" role="option" >C. 1023</li>
                                    <li tabindex="0" role="option" >D. 1024</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】发送窗口是用来暂时保存已经发送但还没有收到确认的数据。发送窗口为&nbsp;2&nbsp;KB，即&nbsp;0~2047&nbsp;为可用窗口。
<br>A&nbsp;开始发送&nbsp;1&nbsp;KB&nbsp;数据，就用了&nbsp;1024&nbsp;字节，其窗口中数据的序号为&nbsp;0~1023，而&nbsp;1024~2047&nbsp;为可用窗口。
<br>发送方&nbsp;A&nbsp;一直发送数据，直到把发送窗口用完，即窗口中数据的序号为&nbsp;0~2047。
<br>发送方&nbsp;A&nbsp;收到对第&nbsp;1000&nbsp;号字节的确认报文段，第&nbsp;1000&nbsp;号字节的数据出窗口，此时，发送窗口中的数据序号为&nbsp;1001~2047，而&nbsp;2048~3048&nbsp;为可用窗口。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497497" id="question883497497" data="883497497">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">136. <span
											class="colorShallow">(单选题)</span>（&nbsp;&nbsp;）是现在通常所用的传播方式，其特点是一对一地传输数据。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b7b726ce068645fba6852e2e03772bb9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 单播</li>
                                    <li tabindex="0" role="option" >B. 广播</li>
                                    <li tabindex="0" role="option" >C. 组播</li>
                                    <li tabindex="0" role="option" >D. 其它三种都不对</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】单播是现在通常所用的传播方式，其特点是一对一地传输数据。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497498" id="question883497498" data="883497498">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">137. <span
											class="colorShallow">(单选题)</span>TCP/IP&nbsp;的网络层最重要的协议是（&nbsp;&nbsp;）互连网协议。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2f109f5dbfbc49a0b65b881d2faa1680', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. IP</li>
                                    <li tabindex="0" role="option" >B. UDP</li>
                                    <li tabindex="0" role="option" >C. TCP</li>
                                    <li tabindex="0" role="option" >D. 其它三种都不是</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;的网络层最重要的协议是&nbsp;IP&nbsp;协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497499" id="question883497499" data="883497499">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">138. <span
											class="colorShallow">(单选题)</span>一个&nbsp;UDP&nbsp;用户数据的数据字段为&nbsp;8192&nbsp;字节，在数据链路层要使用以太网来传送，应当划分为（&nbsp;&nbsp;）个&nbsp;IP&nbsp;数据报片？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('af8012fac86246da82ea9198cfe54a83', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 3</li>
                                    <li tabindex="0" role="option" >B. 4</li>
                                    <li tabindex="0" role="option" >C. 5</li>
                                                        <li tabindex="0" role="option" >D. 6</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由&nbsp;UDP&nbsp;用户数据报结构可知：要传输&nbsp;UDP&nbsp;数据字段为&nbsp;8192&nbsp;个字节的数据，其&nbsp;UDP&nbsp;数据报总长度应为：8192+8=8200&nbsp;字节；又因为数据帧能携带的最大数据长度为&nbsp;1500&nbsp;个字节，所以数据帧能承接网络层的最大&nbsp;IP&nbsp;报文片为&nbsp;1500&nbsp;个字节，若&nbsp;IP&nbsp;报文只有固定首部，IP&nbsp;报文片能承接的&nbsp;UDP&nbsp;最大的数据量为&nbsp;1500-20=1480&nbsp;个字节；8200&nbsp;个字节的&nbsp;UDP&nbsp;报文在数据链路层使用以太网传输
<br>8200/1480=5.54，因此应当划分为&nbsp;6&nbsp;个报片。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497500" id="question883497500" data="883497500">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">139. <span
											class="colorShallow">(单选题)</span>LAN&nbsp;交换机是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('00bde7963be7478e9e625e343d03a10c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 工作在第&nbsp;1&nbsp;层的多端口中继器</li>
                                    <li tabindex="0" role="option" >B. 工作在第&nbsp;2&nbsp;层的多端口集线器</li>
                                    <li tabindex="0" role="option" >C. 工作在第&nbsp;3&nbsp;层的多端口路由器</li>
                                                        <li tabindex="0" role="option" >D. 工作在第&nbsp;2&nbsp;层的多端口网桥</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】交换机是工作与数据链路层的网络设备，每个端口是独立的冲突域，交换机的交换结构保证了多端口同时进行数据交换，多端口的中继器可以认为是集线器，其所有端口处于同一个冲突域内，而不是交换机，交&nbsp;换机属于多端口网桥。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497501" id="question883497501" data="883497501">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">140. <span
											class="colorShallow">(单选题)</span>网桥互联的两个局域网可以采用不同的（&nbsp;&nbsp;）。<BR>Ⅰ、物理层协议<BR>Ⅱ、数据链路层协议<BR>Ⅲ、网络层协议<BR>Ⅳ、运输层协议
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('de5322183fe645638de1b4e3185b64c2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. Ⅰ和Ⅱ</li>
                                    <li tabindex="0" role="option" >B. Ⅰ、Ⅱ和Ⅲ</li>
                                    <li tabindex="0" role="option" >C. Ⅱ和Ⅲ</li>
                                    <li tabindex="0" role="option" >D. Ⅱ、Ⅲ和Ⅳ</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】本题考查点是网桥互联的两个局域网可采用的协议。网桥是工作在数据链路层上的网络互联设备，常用于互联两个或多个遵守&nbsp;IEEE&nbsp;802&nbsp;协议的局域网。从互联层的概念可知，网桥互联的两个局域网允许数据链路层与物理层的采用相同的协议，或者是采用不相同的协议。例如，实际应用中，常用网桥连接两个采用&nbsp;IEEE&nbsp;802&nbsp;协议的NT局域网或两个采用&nbsp;IEEE&nbsp;802&nbsp;协议的&nbsp;Netware&nbsp;局域网。此时，两个局域网的数据链路层和物理层采用相同的协议。由于遵守&nbsp;IEEE&nbsp;802&nbsp;协议的局域网可采用不同的&nbsp;MAC&nbsp;层协议、不同的传输介质和不同的拓扑结构。当遵守&nbsp;IEEE&nbsp;802&nbsp;协议的以太网、令牌环网和令牌总线网利用网桥进行互联时，它们的&nbsp;MAC&nbsp;层协议和物理层协议是不相同的。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497502" id="question883497502" data="883497502">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">141. <span
											class="colorShallow">(单选题)</span>IP&nbsp;数据报使用&nbsp;3&nbsp;个域对数据报的分片进行控制，这&nbsp;3&nbsp;个域是标识、标志和（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('782000d030ef45599bc9e0dcd28c816f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 填充</li>
                                    <li tabindex="0" role="option" >B. 版本</li>
                                                        <li tabindex="0" role="option" >C. 片偏移</li>
                                    <li tabindex="0" role="option" >D. 校验和</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查了&nbsp;IP&nbsp;数据报的分片。
<br>[解题要点]&nbsp;IP数据报使用标识、标志和片偏移三个域对分片进行控制。
<br>[考点链接]&nbsp;IP&nbsp;数据报的重组控制。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497503" id="question883497503" data="883497503">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">142. <span
											class="colorShallow">(单选题)</span>当路由器缓存已满，只能将数据包丢弃时，路由器向源节点发出的&nbsp;ICMP&nbsp;报文类型为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('99361e8cdae04472a2ee7a5a7fa20240', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 目标不可达</li>
                                    <li tabindex="0" role="option" >B. 超时</li>
                                                        <li tabindex="0" role="option" >C. 源抑制</li>
                                    <li tabindex="0" role="option" >D. 重定向</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】当路由器缓存已满，只能将数据包丢弃时，路由器向源节点发出的&nbsp;ICMP&nbsp;报文类型为源抑制。源节点接到这个信息后会降低发送速度。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497504" id="question883497504" data="883497504">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">143. <span
											class="colorShallow">(单选题)</span>某主机的&nbsp;IP&nbsp;地址为&nbsp;202.113.25.55，子网掩码为&nbsp;255.255.255.240。该主机的直接广播地址为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a7485153a8ea4dab9fc63b8f2566b0d6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 202.113.25.63</li>
                                    <li tabindex="0" role="option" >B. 202.113.25.255</li>
                                    <li tabindex="0" role="option" >C. 202.113.25.55</li>
                                    <li tabindex="0" role="option" >D. 255.255.255.255</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;地址&nbsp;202.113.25.55&nbsp;和子网掩码&nbsp;255.255.255.240&nbsp;进行与运算，得到网络号为&nbsp;202.113.25.48，将主机位全置为&nbsp;1，得到直接广播地址为&nbsp;202.113.25.63。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497505" id="question883497505" data="883497505">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">144. <span
											class="colorShallow">(单选题)</span>以下（&nbsp; ）协议可以从已知的网卡地址找到对应的 IP 地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6ce1ce8cdb044e41841abd2cd61eac29', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. ARP&nbsp;协议</li>
                                                        <li tabindex="0" role="option" >B. RARP&nbsp;协议</li>
                                    <li tabindex="0" role="option" >C. IGMP&nbsp;协议</li>
                                    <li tabindex="0" role="option" >D. ICMP&nbsp;协议</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i><p>【解析】地址解析协议 ARP 用来在局域网上从目的 IP 地址得到目的 MAC 地址。逆向地址解析协议 RARP 可以从已知的 MAC 地址找出对应的 IP 地址。</p></div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497506" id="question883497506" data="883497506">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">145. <span
											class="colorShallow">(单选题)</span>在不同网络结点的对等层之间的通信需要下列哪一项协议?（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('46a83432e9c54fdd800236760e83d3ae', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 模块接口</li>
                                                        <li tabindex="0" role="option" >B. 对等层协议</li>
                                    <li tabindex="0" role="option" >C. 电信号</li>
                                    <li tabindex="0" role="option" >D. 传输介质</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在不同网络结点的对等层之间的通信需要对等层协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497507" id="question883497507" data="883497507">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">146. <span
											class="colorShallow">(单选题)</span>局域网拓扑结构常采用的类型有（&nbsp;&nbsp;）结构。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('11af07c5112448478df38b96441548b3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 总线型、网格型和星型</li>
                                    <li tabindex="0" role="option" >B. 环型、网格型和星型</li>
                                    <li tabindex="0" role="option" >C. 总线型、环型和网格型</li>
                                                        <li tabindex="0" role="option" >D. 总线型、环型和星型</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网与广域网的基本通信机制是完全不同的。广域网采用“存储—转发”方式，而局域网采用“共享介质”和“交换”方式，所以局域网在网络拓扑上不采用网格型结构，而是采用总线型、环型和星形结构。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497508" id="question883497508" data="883497508">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">147. <span
											class="colorShallow">(单选题)</span>IGP&nbsp;的作用范围是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('43821f6062af4c5885f9871a4ec6bb14', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 主机</li>
                                    <li tabindex="0" role="option" >B. 子网</li>
                                    <li tabindex="0" role="option" >C. 区域</li>
                                                        <li tabindex="0" role="option" >D. 自治系统</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IGP&nbsp;的作用范围是自治系统（AS）内部。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497509" id="question883497509" data="883497509">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">148. <span
											class="colorShallow">(单选题)</span>以下哪个地址是&nbsp;Ethernet&nbsp;的物理地址（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d5725d2f990d431f99330055d57a2dc5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 10.254.1.220</li>
                                                        <li tabindex="0" role="option" >B. 00-60-08-00-A6-38</li>
                                    <li tabindex="0" role="option" >C. 10-65-08</li>
                                    <li tabindex="0" role="option" >D. ：：：10.0.0.1</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】Ethernet&nbsp;物理地址的基本概念。
<br>[评析]&nbsp;Ethernet&nbsp;物理地址长度为&nbsp;48&nbsp;位（6&nbsp;个字节），允许分配的&nbsp;Ethernet&nbsp;物理地址应该有&nbsp;2⁴⁷&nbsp;个。例如，IEEE&nbsp;分配给&nbsp;3COM&nbsp;公司的&nbsp;Ethernet&nbsp;物理地址的前三个字节可能有多个，其中一个是&nbsp;006008，在局域网地址中，标准的表示方式为&nbsp;00-60-08，它是在两个十六进制数之间用一个连字符隔开。那么&nbsp;3COM&nbsp;公司就可以给它生产的每块&nbsp;Ethernet&nbsp;网卡分配一个后三字节的地址值，假如分配的值为&nbsp;00-A6-38，那么这块&nbsp;Ethernet&nbsp;网卡的物理地址应该是&nbsp;00-60-08-00-A6-38。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497510" id="question883497510" data="883497510">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">149. <span
											class="colorShallow">(单选题)</span>下列关于&nbsp;TCP&nbsp;和&nbsp;UDP&nbsp;的说法正确的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('341e425b61564db384b0a9cf0dcbef0f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 两者都是面向无连接的</li>
                                    <li tabindex="0" role="option" >B. 两者都是面向连接的</li>
                                                        <li tabindex="0" role="option" >C. TCP&nbsp;是面向连接而&nbsp;UDP&nbsp;是面向无连接的</li>
                                    <li tabindex="0" role="option" >D. TCP&nbsp;无连接而&nbsp;UDP&nbsp;是面向连接的</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;协议和&nbsp;UDP&nbsp;协议的特性可简单的描述为：TCP&nbsp;可靠的面向连接的；UDP&nbsp;不可靠的无连接的。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497511" id="question883497511" data="883497511">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">150. <span
											class="colorShallow">(单选题)</span>对&nbsp;IP&nbsp;数据报分片的重组通常发生在（&nbsp;&nbsp;）上。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('27afc21193c046a2b21a3c0f95dec303', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 源主机</li>
                                    <li tabindex="0" role="option" >B. IP&nbsp;数据报经过的路由器</li>
                                                        <li tabindex="0" role="option" >C. 目的主机</li>
                                    <li tabindex="0" role="option" >D. 目的主机或路由器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】对&nbsp;IP&nbsp;数据报分片的重组通常发生在目的主机上。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497512" id="question883497512" data="883497512">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">151. <span
											class="colorShallow">(单选题)</span>若数据链路层采用回退&nbsp;N&nbsp;滑动窗口，发送帧的序列号用&nbsp;7&nbsp;bit&nbsp;表示，发送窗口的最大值为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fa225e6e03f04f758741d282f7d4b0cf', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 7</li>
                                    <li tabindex="0" role="option" >B. 64</li>
                                                        <li tabindex="0" role="option" >C. 127</li>
                                    <li tabindex="0" role="option" >D. 128</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】对于&nbsp;7&nbsp;位的发送序列号，采用回退&nbsp;N&nbsp;帧的协议时，发送窗口的最大值应该是&nbsp;2⁷&nbsp;-1=127。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497513" id="question883497513" data="883497513">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">152. <span
											class="colorShallow">(单选题)</span>申请免费电子信箱必需（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('690bb924468844649a1504a321b91d35', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 写信申请</li>
                                    <li tabindex="0" role="option" >B. 电话申请</li>
                                    <li tabindex="0" role="option" >C. 电子邮件申请</li>
                                                        <li tabindex="0" role="option" >D. 在线注册申请</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】申请免费电子信箱必需在线注册申请。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497514" id="question883497514" data="883497514">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">153. <span
											class="colorShallow">(单选题)</span>（&nbsp;&nbsp;）是使用集线器的缺点。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5997d9dd30c9482c9762705edee0cd7d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 集线器不能延伸网络可操作的距离</li>
                                                        <li tabindex="0" role="option" >B. 集线器不能过滤网络流量</li>
                                    <li tabindex="0" role="option" >C. 集线器不能在网络上发送变弱的信号</li>
                                    <li tabindex="0" role="option" >D. 集线器不能放大变弱的信号</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】集线器是局域网中使用的连接设备，它具有多个端口，可连接多台计算机。在局域网中常以集线器为中心，将所有分散的工作站与服务器连接在一起，形成星型结构的局域网系统。集线器的主要功能是对接收到的信号进行再生整形放大，以扩大网络的传输距离，同时把所有节点集中在以它为中心的节点上。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497515" id="question883497515" data="883497515">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">154. <span
											class="colorShallow">(单选题)</span>用户已知的三个域名服务器的&nbsp;IP&nbsp;地址和对应的域名分别为&nbsp;10.120.81.96，dns.abc.org；105.28.98.3，dns.abc.com；175.102.28.65，dns.abc.net。用户可以将其计算机的域名服务器设置为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('81e2da43b6a34bad8262be8f2c278cda', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. dns.abc.org</li>
                                    <li tabindex="0" role="option" >B. dns.abc.com</li>
                                    <li tabindex="0" role="option" >C. dns.abc.net</li>
                                                        <li tabindex="0" role="option" >D. 175.102.28.65</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】域名服务器需设定固定的&nbsp;IP&nbsp;地址。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497516" id="question883497516" data="883497516">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">155. <span
											class="colorShallow">(单选题)</span>OSI&nbsp;参考模型的网络层对应于&nbsp;TCP/IP&nbsp;参考模型的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('061d6f021b124bc2a1deb84742359d1e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 网络接口层</li>
                                                        <li tabindex="0" role="option" >B. 网际层</li>
                                    <li tabindex="0" role="option" >C. 运输层</li>
                                    <li tabindex="0" role="option" >D. 应用层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;同&nbsp;OSI&nbsp;模型一样，也是采用分层式定义各层协议。其中从协议所覆盖的功能上看，TCP/IP&nbsp;参考模型的应用层与&nbsp;OSI&nbsp;应用层、表示层和会话层相对应，运输层与&nbsp;OSI&nbsp;运输层相对应，网际层与&nbsp;OSI&nbsp;网络层相对应，网络接口层与&nbsp;OSI&nbsp;数据链路层相对应。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497517" id="question883497517" data="883497517">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">156. <span
											class="colorShallow">(单选题)</span>以下不是数据链路层需要实现的功能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('52a5313ffcdd4d769fb83293d53eb3ef', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 差错控制</li>
                                    <li tabindex="0" role="option" >B. 流量控制</li>
                                                        <li tabindex="0" role="option" >C. 路由选择</li>
                                    <li tabindex="0" role="option" >D. 在通信实体之间建立数据链路连接</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据链路的主要功能是：在物理层提供比特流传输服务的基础上，在通信实体之间建立数据链路连接，传送帧为单位的数据，路由选择功能是在网络层完成的，不是数据传输各层实现的功能。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497518" id="question883497518" data="883497518">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">157. <span
											class="colorShallow">(单选题)</span>FTP&nbsp;是基于&nbsp;Client/Server&nbsp;结构通信的，作为服务器一方的进程，通过监听端口&nbsp;21&nbsp;得知有服务请求，在一次会话中，存在（&nbsp;&nbsp;）个&nbsp;TCP&nbsp;连接。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('24f982c2ce8c41db9c26468dbc08155f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 0</li>
                                    <li tabindex="0" role="option" >B. 1</li>
                                                        <li tabindex="0" role="option" >C. 2</li>
                                    <li tabindex="0" role="option" >D. 3</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】FTP&nbsp;使用客户机/服务器的工作方式，客户端要在自己的计算机上安装&nbsp;FTP&nbsp;客户程序。使用&nbsp;FTP&nbsp;可传送任何类型的文件。在进行文件传输时，FTP&nbsp;客户机和服务器之间要建立两个连接：控制连接和数据连接。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497519" id="question883497519" data="883497519">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">158. <span
											class="colorShallow">(单选题)</span>局部地区通信网络简称局域网，英文缩写为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bf291f5bb76446f794f86133a738245a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. WAN</li>
                                                        <li tabindex="0" role="option" >B. LAN</li>
                                    <li tabindex="0" role="option" >C. SAN</li>
                                    <li tabindex="0" role="option" >D. MAN</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】LAN&nbsp;全称为（Local&nbsp;Area&nbsp;Network），其中文含义为局域网。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497520" id="question883497520" data="883497520">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">159. <span
											class="colorShallow">(单选题)</span>下列（&nbsp;&nbsp;）是组播地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('325a9444acb949d3851c7e8d68bdd0e5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 202.113.72.6</li>
                                                        <li tabindex="0" role="option" >B. 224.0.1.129</li>
                                    <li tabindex="0" role="option" >C. 59.67.33.8</li>
                                    <li tabindex="0" role="option" >D. 178.1.2.8</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;组播地址。
<br>[评析]&nbsp;组播地址的范围为&nbsp;224.0.0.0～239.255.255.255。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497521" id="question883497521" data="883497521">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">160. <span
											class="colorShallow">(单选题)</span>通常把没有经过调制的原始信号称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6f9fb91b35f647ab97ffbcaf57074df1', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 基带信号</li>
                                    <li tabindex="0" role="option" >B. 宽带信号</li>
                                    <li tabindex="0" role="option" >C. 频带信号</li>
                                    <li tabindex="0" role="option" >D. 带通信号</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】基带信号就是将数字信号&nbsp;1&nbsp;或&nbsp;0&nbsp;直接用两种不同的电压来表示，然后送到线路上去传输。原始的、没有经过调制的数字信号称为基带信号。宽带信号是将基带信号进行调制后的频分复用模拟信号。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497522" id="question883497522" data="883497522">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">161. <span
											class="colorShallow">(单选题)</span>关于互联网中的主机和路由器，以下哪些说法是正确的?&nbsp;（&nbsp;&nbsp;）<BR>Ⅰ．主机通常需要实现&nbsp;TCP&nbsp;协议<BR>Ⅱ．路由器必须实现&nbsp;TCP&nbsp;协议<BR>Ⅲ．主机必须实现&nbsp;IP&nbsp;协议<BR>Ⅳ．路由器必须实现&nbsp;IP&nbsp;协议
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('baa7040a46004727a95f3dec42171f52', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. Ⅰ、Ⅱ和Ⅲ&nbsp;&nbsp;&nbsp;&nbsp;</li>
                                    <li tabindex="0" role="option" >B. Ⅰ、Ⅱ和Ⅳ</li>
                                                        <li tabindex="0" role="option" >C. Ⅰ、Ⅲ和Ⅳ&nbsp;&nbsp;&nbsp;&nbsp;</li>
                                    <li tabindex="0" role="option" >D. Ⅱ、Ⅲ和Ⅳ</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;是一个端到端的传输协议，所以主机通常需要实现&nbsp;TCP&nbsp;协议，而&nbsp;TCP&nbsp;使用&nbsp;IP&nbsp;在路由器之间传送信息，所以主机和路由器必须实现&nbsp;IP&nbsp;协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497523" id="question883497523" data="883497523">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">162. <span
											class="colorShallow">(单选题)</span>可能引起广播风暴的网络设备是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3d11e079de994335939fae61e304eaae', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 路由器</li>
                                                        <li tabindex="0" role="option" >B. 网桥</li>
                                    <li tabindex="0" role="option" >C. 防火墙</li>
                                    <li tabindex="0" role="option" >D. 网关</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】只有网桥没有隔离广播功能。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497524" id="question883497524" data="883497524">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">163. <span
											class="colorShallow">(单选题)</span>以下哪个地址是&nbsp;MAC&nbsp;地址?（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('dbe1d04b5b814db1bfc00bb05f57ec96', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 0D-01-22-AA</li>
                                                        <li tabindex="0" role="option" >B. 00-01-22-0A-AD-01</li>
                                    <li tabindex="0" role="option" >C. A0.01.00</li>
                                    <li tabindex="0" role="option" >D. 139.216.000.012.002</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】典型的&nbsp;MAC&nbsp;地址长度为&nbsp;48&nbsp;位（6&nbsp;个字节），标准的表示方法是在两个十六进制数之间用一个连字符隔开。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497525" id="question883497525" data="883497525">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">164. <span
											class="colorShallow">(单选题)</span>不能作为&nbsp;FTP&nbsp;客户端工具的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('401915064f994850a82437f8ebb97184', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. ftp.exe</li>
                                                        <li tabindex="0" role="option" >B. telnet.exe</li>
                                    <li tabindex="0" role="option" >C. IE</li>
                                    <li tabindex="0" role="option" >D. QQ&nbsp;浏览器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】Telnet&nbsp;是远程登录工具，不是&nbsp;FTP&nbsp;客户端工具。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497526" id="question883497526" data="883497526">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">165. <span
											class="colorShallow">(单选题)</span>比特流传输所在层次是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3b23fd3450994828866c2165873b56b4', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 物理层</li>
                                    <li tabindex="0" role="option" >B. 网络层</li>
                                    <li tabindex="0" role="option" >C. 数据链路层</li>
                                    <li tabindex="0" role="option" >D. 运输层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】物理层传输的数据是比特流，数据链路层传输的数据是帧，网络层传输的数据是分组。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497527" id="question883497527" data="883497527">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">166. <span
											class="colorShallow">(单选题)</span>在互联网上的各个节点，地位上都是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2a965db41c294f438f1a6a68ed8a483f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 平等的</li>
                                    <li tabindex="0" role="option" >B. 有主次之分</li>
                                    <li tabindex="0" role="option" >C. 不平等的</li>
                                    <li tabindex="0" role="option" >D. 资源的使用者</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在互联网上的各个节点，地位上都是平等的。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497528" id="question883497528" data="883497528">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">167. <span
											class="colorShallow">(单选题)</span>对&nbsp;IP&nbsp;数据报进行分片的主要目的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c5055ee42be64814ba6f1f2407aa7fd8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 适应各个物理网络不同的地址长度</li>
                                    <li tabindex="0" role="option" >B. 拥塞控制</li>
                                                        <li tabindex="0" role="option" >C. 适应各个物理网络不同的MTU长度</li>
                                    <li tabindex="0" role="option" >D. 流量控制</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;封装、分片与重组。
<br>[评析]&nbsp;根据网络使用的技术不同，每种网络都规定了一个帧量多能够携带的数据量，这一限制称为量大传输单元（MTU）。因此，一个&nbsp;IP&nbsp;数据报的长度只有小于或等于一个网络的&nbsp;MTU&nbsp;时，才能在这个网络中进行传输。为了解决这一问题，IP&nbsp;互联网通常采用分片与重组技术。当一个数据报的尺寸大于将发往网络的&nbsp;MTU&nbsp;时，路由器会将&nbsp;IP&nbsp;数据报分成若干较小的部分，称为分片，然后再将每片独立地进行发送。在接收到所有分片的基础上，主机对分片进行重新组装的过程称为&nbsp;IP&nbsp;数据报重组。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497529" id="question883497529" data="883497529">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">168. <span
											class="colorShallow">(单选题)</span>VLAN&nbsp;在现代组网技术中占有重要地位，同一个&nbsp;VLAN&nbsp;中的两台主机（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6402cb01d9ff465c8c7dca08b4487839', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 必须连接在同一交换机上</li>
                                                        <li tabindex="0" role="option" >B. 可以跨越多台交换机</li>
                                    <li tabindex="0" role="option" >C. 必须连接在同一集线器上</li>
                                    <li tabindex="0" role="option" >D. 可以跨越多台路由器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】虚拟局域网&nbsp;VLAN&nbsp;是建立在交换基础上的。同一虚拟局域网中的成员不一定要连接在同一物理网段，可连接在不同的局域网交换机上，只要这些交换机是互连的就可以了。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497530" id="question883497530" data="883497530">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">169. <span
											class="colorShallow">(单选题)</span>在互联网中，人们通过&nbsp;WWW&nbsp;浏览器观看到的网站的第一个页面称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('70acbb5503174068bfbe31e2cddfdb3e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 主页</li>
                                    <li tabindex="0" role="option" >B. Web页</li>
                                    <li tabindex="0" role="option" >C. URL</li>
                                    <li tabindex="0" role="option" >D. 网址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在互联网中，人们通过&nbsp;WWW&nbsp;浏览器观看到的网站的第一个页面称为主页。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497531" id="question883497531" data="883497531">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">170. <span
											class="colorShallow">(单选题)</span>在互联网中，路由器通常利用以下哪个字段进行路由选择（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e5c9866785c84f9eb4dc68344d47f922', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 源IP地址</li>
                                                        <li tabindex="0" role="option" >B. 目的IP地址</li>
                                    <li tabindex="0" role="option" >C. 源MAC地址</li>
                                    <li tabindex="0" role="option" >D. 目的MAC地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】路由器和路由选择算法。
<br>[评析]&nbsp;互联网中的路由选择算法通常使用一张&nbsp;IP&nbsp;路由选择表（也称为路由表），一个路由表通常包含许多（N，R）对序偶，其中&nbsp;N&nbsp;指的是目的网络&nbsp;IP&nbsp;地址，R&nbsp;是到网络&nbsp;N&nbsp;路径上的下一个路由器的&nbsp;IP&nbsp;地址。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497532" id="question883497532" data="883497532">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">171. <span
											class="colorShallow">(单选题)</span>光纤作为传输介质的主要特点是（&nbsp;&nbsp;）。<BR>Ⅰ．保密性好<BR>Ⅱ．高带宽<BR>Ⅲ．低误码率<BR>Ⅳ．拓扑结构复杂
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fb762916ac65441884556daf2c993f0a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. Ⅰ、Ⅱ和Ⅳ</li>
                                                        <li tabindex="0" role="option" >B. Ⅰ、Ⅱ和Ⅲ</li>
                                    <li tabindex="0" role="option" >C. Ⅱ和Ⅳ</li>
                                    <li tabindex="0" role="option" >D. Ⅲ和Ⅳ</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】传输介质的特点。
<br>[评析]&nbsp;光纤作为传输介质的主要特点有高带宽、高保密性、低误码率。在&nbsp;10&nbsp;Mbps&nbsp;的局域网环境中，光纤的带宽没有得到很好的利用，因此光纤通常用于长距离、高速率、抗干扰和保密性要求高的应用领域中。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497533" id="question883497533" data="883497533">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">172. <span
											class="colorShallow">(单选题)</span>如果一个用户通过电话网将自己的主机接入互联网，以访问互联网上的&nbsp;Web&nbsp;站点，那么用户不需要在这台主机上安装和配置（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('46cfd33814ab411b9aa47ba7587767e3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 调制解调器</li>
                                                        <li tabindex="0" role="option" >B. 网卡</li>
                                    <li tabindex="0" role="option" >C. TCP/IP协议</li>
                                    <li tabindex="0" role="option" >D. WWW浏览器</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】接入互联网。
<br>[评析]&nbsp;通过电话拨号线路接入互联网，除计算机必备的操作系统之外，还必须提供调制解调器将电话线路与上网主机相联、访问&nbsp;Web&nbsp;站点采用的浏览器、接入互联网的&nbsp;TCP/IP&nbsp;协议，而网卡用于连接局域网内部的计算机。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497534" id="question883497534" data="883497534">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">173. <span
											class="colorShallow">(单选题)</span>网卡实现的主要功能是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f644c08f70304f669d3558c4daea5281', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 物理层与网络层的功能</li>
                                    <li tabindex="0" role="option" >B. 网络层与应用层的功能</li>
                                                        <li tabindex="0" role="option" >C. 物理层与数据链路层的功能</li>
                                    <li tabindex="0" role="option" >D. 网络层与表示层的功能</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网卡是连接计算机和传输介质的设备。网卡即网络接口卡（Network&nbsp;Interface&nbsp;Card，NIC），它是构成网络的基本部件，一般存在于联网计算机内部，负责连接计算机和传输介质。网卡是最常用的插卡之一，实现数据链路层的功能，如形成数据桢、差错校验、发送接收等；实现物理层的功能，如对发送信号的传输驱动、对接收信号的侦听与接收、对数据的缓存以及串行并行转换等。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497535" id="question883497535" data="883497535">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">174. <span
											class="colorShallow">(单选题)</span>通常数据链路层交换的协议数据单元被称作（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b5575001d7c340dbb0007f53860cc583', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 比特</li>
                                                        <li tabindex="0" role="option" >B. 帧</li>
                                    <li tabindex="0" role="option" >C. 报文</li>
                                    <li tabindex="0" role="option" >D. 报文分组</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据链路层数据的基本单位是帧。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497536" id="question883497536" data="883497536">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">175. <span
											class="colorShallow">(单选题)</span>网络协议中规定通信双方要发出什么控制信息，执行的动作和返回的应答的部分称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('abd96261aaba46d2b850bd4e31116b3f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 语法部分</li>
                                                        <li tabindex="0" role="option" >B. 语义部分</li>
                                    <li tabindex="0" role="option" >C. 定时关系</li>
                                    <li tabindex="0" role="option" >D. 其它三种都不是</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络协议中规定通信双方要发出什么控制信息，执行的动作和返回的应答的部分称为语义部分。网络协议由语法、语义和同步组成。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497537" id="question883497537" data="883497537">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">176. <span
											class="colorShallow">(单选题)</span>当使用拨号方式上网时，先要选择合适的（&nbsp;&nbsp;），这是实现拨号上网的重要步骤。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8a2041b9288541089df67c22807f7fa6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IP地址</li>
                                    <li tabindex="0" role="option" >B. 浏览器</li>
                                                        <li tabindex="0" role="option" >C. ISP</li>
                                    <li tabindex="0" role="option" >D. 通信协议</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】当使用&nbsp;PSTN&nbsp;拨号接入方式时，选择合适的&nbsp;ISP&nbsp;是实现拨号上网的重要步骤。若要进行拨号上网，首先要向互联网服务提供商&nbsp;ISP（InternetServiceProvider）申请一个合法的身份，即账号。ISP&nbsp;基本的服务是：在你通过凋制解凋器拨打&nbsp;ISP&nbsp;提供的电话号码时，同样配置了调制解调器的&nbsp;ISP&nbsp;的服务器能够在电话线的另一端接通你的呼叫，与你的计算机建立起连接。因为&nbsp;ISP&nbsp;的服务器与互联网连接，所以你的计算机就通过&nbsp;ISP&nbsp;的服务器与互联网相连。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497538" id="question883497538" data="883497538">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">177. <span
											class="colorShallow">(单选题)</span>己知主机&nbsp;A&nbsp;要向主机&nbsp;B&nbsp;发送&nbsp;3&nbsp;KB&nbsp;的数据。在&nbsp;TCP&nbsp;连接建立后，A&nbsp;的发送窗口大小是&nbsp;2&nbsp;KB，A&nbsp;的初始序号是&nbsp;0。A&nbsp;发送&nbsp;1&nbsp;KB&nbsp;的数据，接着&nbsp;A&nbsp;就一直发送数据，直到把发送窗口用完。这时发送方&nbsp;A&nbsp;收到对第&nbsp;1000&nbsp;号字节的确认报文段。发送窗口中数据的最大序号是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4dc06e2e70ab4e04985a2bc9b1e8e729', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 2047</li>
                                    <li tabindex="0" role="option" >B. 2048</li>
                                    <li tabindex="0" role="option" >C. 3047</li>
                                    <li tabindex="0" role="option" >D. 3048</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】发送窗口是用来暂时保存已经发送但还没有收到确认的数据。发送窗口为&nbsp;2&nbsp;KB，即&nbsp;0~2047&nbsp;为可用窗口。
<br>A&nbsp;开始发送&nbsp;1&nbsp;KB&nbsp;数据，就用了&nbsp;1024&nbsp;字节，其窗口中数据的序号为&nbsp;0~1023，而&nbsp;1024~2047&nbsp;为可用窗口。
<br>发送方&nbsp;A&nbsp;一直发送数据，直到把发送窗口用完，即窗口中数据的序号为&nbsp;0~2047。
<br>发送方&nbsp;A&nbsp;收到对第&nbsp;1000&nbsp;号字节的确认报文段，第&nbsp;1000&nbsp;号字节的数据出窗口，此时，发送窗口中的数据序号为&nbsp;1001~2047，而&nbsp;2048~3048&nbsp;为可用窗口。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497539" id="question883497539" data="883497539">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">178. <span
											class="colorShallow">(单选题)</span>串行通信中，PPP&nbsp;协议面向的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c60163e78eac4645a64f11281e39b10b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 字符</li>
                                    <li tabindex="0" role="option" >B. 比特</li>
                                    <li tabindex="0" role="option" >C. 字节</li>
                                    <li tabindex="0" role="option" >D. 字</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】PPP&nbsp;协议中所携带的数据是以字符为单位进行计数的。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497540" id="question883497540" data="883497540">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">179. <span
											class="colorShallow">(单选题)</span>以下（&nbsp;&nbsp;）服务使用&nbsp;POP3&nbsp;协议。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d416beca9e2a4575a52f44431681b4c0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. FTP</li>
                                                        <li tabindex="0" role="option" >B. E-mail</li>
                                    <li tabindex="0" role="option" >C. WWW</li>
                                    <li tabindex="0" role="option" >D. Telnet</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】互联网基础。
<br>[评析]&nbsp;E-mail&nbsp;服务利用&nbsp;POP3&nbsp;协议，使接收端的用户可以在任何时间、地点利用电子邮件应用程序从自己的邮箱中读取邮件，并对自己的邮件进行管理。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497541" id="question883497541" data="883497541">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">180. <span
											class="colorShallow">(单选题)</span>域名解析过程中，每次请求一个服务器，不行再请求别的服务器，称为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d7a2681befee41848debb7af393e4f12', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 递归解析</li>
                                                        <li tabindex="0" role="option" >B. 迭代解析</li>
                                    <li tabindex="0" role="option" >C. 循环解析</li>
                                    <li tabindex="0" role="option" >D. 层次解析</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查域名解析的具体步骤。
<br>[解题要点]&nbsp;域名解析有递归解析与迭代解析两种方式。
<br>[考点链接]&nbsp;域名解析的具体请求过程两种方式。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497542" id="question883497542" data="883497542">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">181. <span
											class="colorShallow">(单选题)</span>具有&nbsp;24&nbsp;个&nbsp;10&nbsp;M&nbsp;端口的交换机的总带宽可以达到（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1302d8ccff37448a91cc123481df0784', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 10M</li>
                                    <li tabindex="0" role="option" >B. 100M</li>
                                                        <li tabindex="0" role="option" >C. 240M</li>
                                    <li tabindex="0" role="option" >D. 10/24&nbsp;M</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】交换机属于多端口网桥，是数据链路层设备，由于其各端口是独立的，并非共享链路，可以分割冲突域，因此不同端口上的主机同时发送数据时不会发送冲突，所以总带宽可以达到&nbsp;24*10=240&nbsp;M。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497543" id="question883497543" data="883497543">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">182. <span
											class="colorShallow">(单选题)</span>一个&nbsp;/24&nbsp;的地址块，把它划分为大小相等的子网，若子网掩码为&nbsp;255.255.255.240，划分子网数为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('90cfd4cb8de64367b9767b5681efb0de', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 8</li>
                                    <li tabindex="0" role="option" >B. 6</li>
                                    <li tabindex="0" role="option" >C. 14</li>
                                                        <li tabindex="0" role="option" >D. 16</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】对于&nbsp;/24&nbsp;的地址块，划分大小相等的子网，只能对最后一个字节进行划分
<br>将掩码&nbsp;240&nbsp;转换为二进制为&nbsp;11110000，则子网位为&nbsp;4&nbsp;个
<br>子网个数为：2⁴&nbsp;=16。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497544" id="question883497544" data="883497544">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">183. <span
											class="colorShallow">(单选题)</span>在&nbsp;TCP/IP&nbsp;协议体系中，TCP&nbsp;是一种（&nbsp;&nbsp;）协议。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6e1cab51818746b1a99bc3fb96365061', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 网络接口层</li>
                                    <li tabindex="0" role="option" >B. 网际层</li>
                                                        <li tabindex="0" role="option" >C. 运输层</li>
                                    <li tabindex="0" role="option" >D. 应用层</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;TCP/IP&nbsp;协议体系中，TCP&nbsp;是运输层的协议。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497545" id="question883497545" data="883497545">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">184. <span
											class="colorShallow">(单选题)</span>中心结点出现故障造成全网瘫痪的网络是（&nbsp;&nbsp;）结构网络。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d57516276c8842ba8ec16c3afb7923df', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 总线</li>
                                                        <li tabindex="0" role="option" >B. 星型</li>
                                    <li tabindex="0" role="option" >C. 树型</li>
                                    <li tabindex="0" role="option" >D. 球型</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在所有结构网络中，只有星型网络才有中心结点。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497546" id="question883497546" data="883497546">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">185. <span
											class="colorShallow">(单选题)</span>关于&nbsp;ARP&nbsp;协议的描述中，正确的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5ef75a628d414029ab19ffbcb1c2cff3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 请求采用单播方式，应答采用广播方式</li>
                                                        <li tabindex="0" role="option" >B. 请求采用广播方式，应答采用单播方式</li>
                                    <li tabindex="0" role="option" >C. 请求和应答者采用广播方式</li>
                                    <li tabindex="0" role="option" >D. 请求和应答都采用单播方式</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】地址解析协议&nbsp;ARP。
<br>[评析]&nbsp;地址解析协议（ARP）是以太网经常使用的映射方法，它充分利用了以太网的广播能力，将&nbsp;IP&nbsp;地址与物理地址进行动态绑定。ARP&nbsp;请求为广播方式，ARP&nbsp;应答为单播方式。ARP&nbsp;有个特点，就算没有&nbsp;ARP&nbsp;请求也可以利用&nbsp;ARP&nbsp;应答去更新其他机器的&nbsp;ARP&nbsp;CACHE&nbsp;内的记录。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497547" id="question883497547" data="883497547">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">186. <span
											class="colorShallow">(单选题)</span>下列（&nbsp;&nbsp;）不是组播地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('47174c62dda34b70ae3fdb5c30ac0748', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 230.16.2.1</li>
                                    <li tabindex="0" role="option" >B. 225.34.2.7</li>
                                    <li tabindex="0" role="option" >C. 229.60.0.8</li>
                                                        <li tabindex="0" role="option" >D. 178.1.2.8</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;组播地址。
<br>[评析]&nbsp;组播地址的范围为&nbsp;224.0.0.0～239.255.255.255。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497548" id="question883497548" data="883497548">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">187. <span
											class="colorShallow">(单选题)</span>（&nbsp;&nbsp;）是工作在&nbsp;IP&nbsp;协议之上，让连接在本地&nbsp;LAN&nbsp;上的多播路由器知道本&nbsp;LAN&nbsp;上是否有主机的进程参加或退出了某个多播组。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6be3888748034771860db19899f975c6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. SMTP</li>
                                                        <li tabindex="0" role="option" >B. IGMP</li>
                                    <li tabindex="0" role="option" >C. ICMP</li>
                                    <li tabindex="0" role="option" >D. SNMP</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IGMP&nbsp;协议是组播协议，它不能直接传输数据，必须加载到&nbsp;IP&nbsp;协议之上。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497549" id="question883497549" data="883497549">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">188. <span
											class="colorShallow">(单选题)</span>TCP/IP&nbsp;的运输层协议使用（&nbsp;&nbsp;）形式将数据传送给上层应用程序。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3c06bde6064c46b594de971d461f4621', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IP&nbsp;地址</li>
                                    <li tabindex="0" role="option" >B. MAC&nbsp;地址</li>
                                                        <li tabindex="0" role="option" >C. 端口号</li>
                                    <li tabindex="0" role="option" >D. 套接字地址</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;协议族中的运输层协议即&nbsp;TCP&nbsp;和&nbsp;UDP&nbsp;协议都通过端口号来标识不同的应用进程。因此，TCP&nbsp;和&nbsp;UDP&nbsp;都根据端口号将数据传送给上层的应用程序。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497550" id="question883497550" data="883497550">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">189. <span
											class="colorShallow">(单选题)</span>设某路由器建立了如下路由表：<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一跳<BR>192.4.153.0/26&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₃<BR>128.96.39.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m0<BR>128.96.39.128/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口m1<BR>128.96.40.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₂<BR>*（默认）&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R₄<BR>现收到目的&nbsp;IP&nbsp;地址&nbsp;192.4.153.12，其下一跳是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e71860d1ef6844f88942a32e02f9da34', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 接口&nbsp;m0</li>
                                                        <li tabindex="0" role="option" >B. R₃</li>
                                    <li tabindex="0" role="option" >C. R₂</li>
                                    <li tabindex="0" role="option" >D. R₄</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> B</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目的&nbsp;IP&nbsp;地址&nbsp;192.4.153.17&nbsp;与子网掩码&nbsp;255.255.255.128&nbsp;相与后得&nbsp;192.4.153.0&nbsp;。与子网掩码255.255.255.192&nbsp;相与后得&nbsp;192.4.153.0，经查路由表知，该分组经&nbsp;R₃&nbsp;转发。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497551" id="question883497551" data="883497551">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">190. <span
											class="colorShallow">(单选题)</span>在同一个信道上的同一时刻，能够进行双向数据传送的通信方式是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c3bdbedbe71e4ec68ffff86b99317a24', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 单工</li>
                                    <li tabindex="0" role="option" >B. 半双工</li>
                                                        <li tabindex="0" role="option" >C. 全双工</li>
                                    <li tabindex="0" role="option" >D. 其它都不是</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据传输方式有单工传输、半双工传输和全双工传输。
<br>单工传输是在一个单一不变的方向上进行信&nbsp;息传输的通信方式，只有一个方向不变的单向信道连接了两个设备。
<br>半双工传输是通信双方都可以发送信息，但&nbsp;不能双方同时发送。
<br>全双工传输是通信双方可以同时发送和接收信息，即两设备之间存在两条不同方向的信息传&nbsp;输通道，可以同时在两个方向上传输数据。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497552" id="question883497552" data="883497552">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">191. <span
											class="colorShallow">(单选题)</span>一台主机的&nbsp;IP&nbsp;地址为&nbsp;202.113.224.68/28，那么这台主机的主机号为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('73d6368c132b44778be488f027019b48', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 4</li>
                                    <li tabindex="0" role="option" >B. 6</li>
                                    <li tabindex="0" role="option" >C. 8</li>
                                    <li tabindex="0" role="option" >D. 68</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】本题考查点是&nbsp;IP&nbsp;地址和子网掩码的计算。
<br>用&nbsp;IP&nbsp;地址&nbsp;202.113.224.68&nbsp;与&nbsp;255.255.255.240&nbsp;相与得网络号&nbsp;202.113.224.64。
<br>主机号是&nbsp;IP&nbsp;地址减去网络号，可得主机号为&nbsp;4。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497553" id="question883497553" data="883497553">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">192. <span
											class="colorShallow">(单选题)</span>在停止等待协议中使用计时器的主要目的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('987c33c2e4ae4af795e24233c958e0d0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 计算已发数据的数目</li>
                                    <li tabindex="0" role="option" >B. 表示下一个要发送的数据序号</li>
                                                        <li tabindex="0" role="option" >C. 超时重发</li>
                                    <li tabindex="0" role="option" >D. 分配序号</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在停止等待协议中使用计时器的主要目的是进行超时重发。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497554" id="question883497554" data="883497554">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">193. <span
											class="colorShallow">(单选题)</span>局域网交换机的特性是（&nbsp;&nbsp;）。<BR>Ⅰ．低交换传输延迟<BR>Ⅱ．高传输带宽<BR>Ⅲ．允许&nbsp;10/100&nbsp;Mbps&nbsp;共存<BR>Ⅳ．局域网交换机可以支持虚拟局域网服务
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4acc6d791f344b7395e3a988c803f788', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. Ⅰ、Ⅱ、Ⅲ</li>
                                    <li tabindex="0" role="option" >B. Ⅰ、Ⅱ、Ⅳ</li>
                                    <li tabindex="0" role="option" >C. Ⅰ、Ⅱ</li>
                                                        <li tabindex="0" role="option" >D. Ⅰ、Ⅱ、Ⅲ和Ⅳ</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网交换网的特性主要有下列几点：①低交换传输延迟；②高传输带宽；③允许&nbsp;10/100&nbsp;Mbps&nbsp;共存；④局域网交换机可以支持虚拟局域网服务。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497555" id="question883497555" data="883497555">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">194. <span
											class="colorShallow">(单选题)</span>把计算机网络看成是自治的计算机系统的集合，其中“自治的计算机”主要指（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5feddf994944417b8f751ff08740322d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 可以独立运行的计算机</li>
                                    <li tabindex="0" role="option" >B. 网络计算机</li>
                                    <li tabindex="0" role="option" >C. 裸机</li>
                                    <li tabindex="0" role="option" >D. 网络终端</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】自治的计算机主要是指具有独立运行和处理能力的计算机。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497556" id="question883497556" data="883497556">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">195. <span
											class="colorShallow">(单选题)</span>当源节点收到报文类型号为&nbsp;3&nbsp;的&nbsp;ICMP&nbsp;报文时，表示（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1db06cffdccc46eb8a6001510a30e176', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 目标不可达</li>
                                    <li tabindex="0" role="option" >B. 超时</li>
                                    <li tabindex="0" role="option" >C. 源抑制</li>
                                    <li tabindex="0" role="option" >D. 重定向</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目标不可达的类型号是&nbsp;3，超时的类型号是&nbsp;11，源抑制的类型号是&nbsp;4，重定向的类型号是&nbsp;5。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497557" id="question883497557" data="883497557">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">196. <span
											class="colorShallow">(单选题)</span>光纤接入技术中，光纤到路边指的是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('28ed928a419a4a728dd3c2837358f2c9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. FTTZ</li>
                                    <li tabindex="0" role="option" >B. FTTB</li>
                                    <li tabindex="0" role="option" >C. FTTO</li>
                                                        <li tabindex="0" role="option" >D. FTTC</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】FTTx&nbsp;属于光纤接入技术到什么地点，其中，x&nbsp;代表地点。如：FTTH&nbsp;代表光纤到家；FTTB&nbsp;代表光纤到楼；FTTC&nbsp;代表光纤到路边等。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497558" id="question883497558" data="883497558">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">197. <span
											class="colorShallow">(单选题)</span>10&nbsp;Gbps&nbsp;Ethernet&nbsp;采用的标准是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('791d556def2b4de4a02ddfffd34db89b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. IEEE&nbsp;802.3a</li>
                                    <li tabindex="0" role="option" >B. IEEE&nbsp;802.3ab</li>
                                                        <li tabindex="0" role="option" >C. IEEE&nbsp;802.3ae</li>
                                    <li tabindex="0" role="option" >D. IEEE&nbsp;802.3u</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】Ethernet&nbsp;工作在&nbsp;OSI&nbsp;网络模型的物理层和数据链路层。这是由&nbsp;IEEE&nbsp;802.3&nbsp;规定的，而&nbsp;10&nbsp;Gbit/s&nbsp;标准则由&nbsp;802.ae&nbsp;定义。后者和最初的&nbsp;Ethernet&nbsp;标准遵循着同样的标准（MAC&nbsp;协议、帧尺寸和格式等）&nbsp;，其实质上的唯一区别是&nbsp;10&nbsp;Gbit/s&nbsp;不使用或不需要其他&nbsp;Ethernet&nbsp;常用的&nbsp;CSMA/CD&nbsp;协议，因为它只工作在全双工状态。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497559" id="question883497559" data="883497559">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">198. <span
											class="colorShallow">(单选题)</span>通过（&nbsp;&nbsp;）接入因特网是一个部门或单位的计算机接入因特网常用的方法。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fff75161c74f488aab6b30723e44366e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 电话线路</li>
                                    <li tabindex="0" role="option" >B. 专用线路</li>
                                                        <li tabindex="0" role="option" >C. 局域网</li>
                                    <li tabindex="0" role="option" >D. 广域网</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> C</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】一个部门或单位的计算机通过局域网接入因特网是常用的方法。一般来说，一个单位可以先组建一个局域网，然后通过路由器将该局域网与&nbsp;ISP&nbsp;相连，用户只需在自己的计算机上安装网卡，运行支持&nbsp;TCP/IP&nbsp;协议的操作系统和相关服务软件，并对计算机进行适当配置，即可使用该计算机通过局域网访问因特网。</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497560" id="question883497560" data="883497560">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">199. <span
											class="colorShallow">(单选题)</span>一个&nbsp;UDP&nbsp;用户数据的数据字段为&nbsp;8192&nbsp;字节，在数据链路层要使用以太网来传送，试问最后一个&nbsp;IP&nbsp;数据报字段长度是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('adde5d0f065c4383b0701817639771fb', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                    <li tabindex="0" role="option" >A. 1518</li>
                                    <li tabindex="0" role="option" >B. 1500</li>
                                    <li tabindex="0" role="option" >C. 1480</li>
                                                        <li tabindex="0" role="option" >D. 800</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> D</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由&nbsp;UDP&nbsp;用户数据报结构可知：要传输&nbsp;UDP&nbsp;数据字段为&nbsp;8192&nbsp;个字节的数据，其&nbsp;UDP&nbsp;数据报总长度应为：8192+8=8200&nbsp;字节；又因为数据帧能携带的最大数据长度为&nbsp;1500&nbsp;个字节，所以数据帧能承接网络层的最大&nbsp;IP&nbsp;报文片为&nbsp;1500&nbsp;个字节，若&nbsp;IP&nbsp;报文只有固定首部，IP&nbsp;报文片能承接的&nbsp;UDP&nbsp;最大的数据量为&nbsp;1500-20=1480&nbsp;个字节；8200&nbsp;个字节的&nbsp;UDP&nbsp;报文在数据链路层使用以太网传输
<br>8200/1480=5.54，因此应当划分为&nbsp;6&nbsp;个报片。其每个&nbsp;IP&nbsp;数据字段长度和片偏移值如下表：
<br>数据报片序号&nbsp;&nbsp;&nbsp;片偏移值&nbsp;&nbsp;&nbsp;数据字段长度
<br>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480
<br>2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;185&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480
<br>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;370&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480
<br>4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;555&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480
<br>5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;740&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480
<br>6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;925&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;800</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497561" id="question883497561" data="883497561">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">200. <span
											class="colorShallow">(单选题)</span>以太网卡的物理地址采用（&nbsp;&nbsp;）个十六进制数字表示?
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f1cf3854ffc84d6ba194dd92cb1b8caa', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
                                                        <li tabindex="0" role="option" >A. 12</li>
                                    <li tabindex="0" role="option" >B. 24</li>
                                    <li tabindex="0" role="option" >C. 32</li>
                                    <li tabindex="0" role="option" >D. 48</li>
    </ul>

<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i></span>
                            <span class="colorGreen marginRight40 fl"><i class="fontWeight">正确答案:</i> A</span>
                        </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】MAC&nbsp;地址的长度为&nbsp;48&nbsp;位（6&nbsp;个字节），通常表示为&nbsp;12&nbsp;个&nbsp;16&nbsp;进制数，如：00-16-EA-AE-3C-40&nbsp;就是一个MAC地址，其中前&nbsp;6&nbsp;位&nbsp;16&nbsp;进制数&nbsp;00-16-EA&nbsp;代表网络硬件制造商的编号，它由&nbsp;IEEE（电气与电子工程师协会）分配，而后&nbsp;6&nbsp;位&nbsp;16&nbsp;进制数&nbsp;AE-3C-40&nbsp;代表该制造商所制造的某个网络产品（如网卡）的系列号。只要不更改自己的MAC地址，MAC&nbsp;地址在世界是惟一的。形象地说，MAC&nbsp;地址就如同身份证上的身份证号码，具有唯一性</div>
        </div>
    
    <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>

    <div class="mark_score"  tabindex="0" role="option"  >
                    <div class=" fl catalog_tishi80">
                <div class="mark_judge_name">
                                            <span class="marking_cuo" aria-label="答案错误"></span>
                                    </div>
            </div>
        
            </div>
</div>															</div>
											
						
						<h2 tabindex="0" role="option" class="type_tit">二. 填空题（共50
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497562" id="question883497562" data="883497562">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(填空题)</span>UDP&nbsp;可以为其用户提供（&nbsp;&nbsp;）的、无连接的传输服务。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0b9668b5cc5c4a76a2900bd8371354c7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497562">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 不可靠;不承诺服务质量</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】用户数据报协议（UDP）是运输层经常用到的一个协议，提供了不可靠的、无连接的传输服务。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497563" id="question883497563" data="883497563">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(填空题)</span>IEEE&nbsp;802&nbsp;参考模型将（&nbsp;&nbsp;）层分为逻辑链路控制子层与媒体接入控制子层。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('aa9f491d374f4022900973cdaa0f43be', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497563">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 数据链路</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i><p>【解析】IEEE&nbsp;802&nbsp;模型将数据链路层划分为&nbsp;LLC&nbsp;子层和&nbsp;MAC&nbsp;子层。</p></div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497564" id="question883497564" data="883497564">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(填空题)</span>网络管理员通过手工配置的路由表，可以称之为（&nbsp;&nbsp;）路由表。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2296cc47f2334a758e0f8066319d3252', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497564">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 静态;非自适应</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网络管理员通过手工配置的路由表，可以称之为非自适应（静态）路由表。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497565" id="question883497565" data="883497565">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(填空题)</span>交换式局域网可以通过交换机端口之间的并发连接增加局域网的（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('103002e091a04c8c911e0c56012acb3a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497565">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 带宽</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】交换式局域网从根本上改变了“共享介质”的工作方式，它可以通过&nbsp;Ethernet&nbsp;Switch&nbsp;支持端口之间的多个并发连接。因此，交换式局域网可以增加网络带宽，改善局域网性能与服务质量。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497566" id="question883497566" data="883497566">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(填空题)</span>IP&nbsp;地址的主机部分如果全为&nbsp;1，则表示广播地址，IP&nbsp;地址的主机部分若全为&nbsp;0，则表示（&nbsp;&nbsp;）地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0527f20312e64d96ac4b6e31d0c8984a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497566">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 网络;网络号</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;地址的主机部分如果全为&nbsp;1，则表示广播地址，IP&nbsp;地址的主机部分若全为&nbsp;0，则表示网络地址。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497567" id="question883497567" data="883497567">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">6. <span
											class="colorShallow">(填空题)</span>/29&nbsp;的地址块内最多可用主机地址数为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0df28412dd5d4b7cba761a6a4fc94afe', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497567">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 6;六</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】255.255.255.248&nbsp;的子网掩码长度为&nbsp;29&nbsp;位，主机位长度为&nbsp;32-29=3&nbsp;位，每个子网内可用的主机地址数为&nbsp;2³&nbsp;-2=6。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497568" id="question883497568" data="883497568">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">7. <span
											class="colorShallow">(填空题)</span>互联网中&nbsp;URL&nbsp;的中文意思是（&nbsp;&nbsp;）定位器。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1defe2bd6d9945b1b61aa6bfba46a749', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497568">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 统一资源</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】互联网中&nbsp;URL&nbsp;的中文意思是统一资源定位器（符）。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497569" id="question883497569" data="883497569">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">8. <span
											class="colorShallow">(填空题)</span>常见的计算机网络拓扑结构有总线型、（&nbsp;&nbsp;）、环型和树型。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a47dd40362cf4e2a8324a7177371a91a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497569">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 星型;星形</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】常见的计算机网络拓扑结构有总线型、星型、环型和树型。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497570" id="question883497570" data="883497570">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">9. <span
											class="colorShallow">(填空题)</span>TCP/IP&nbsp;模型分为四层，它们是应用层、运输层、网际层、（&nbsp;&nbsp;）层。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('346fa1b735834388b9e398cc1555f862', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497570">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 网络接口;网络接口层;链路;链路层</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i><p>【解析】TCP/IP&nbsp;协议将整个通信功能划分为应用层、运输层、网际层（IP 层）和链路层（网络接口层）等四个层次。</p></div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497571" id="question883497571" data="883497571">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">10. <span
											class="colorShallow">(填空题)</span>IP&nbsp;地址为&nbsp;125.3.54.56&nbsp;的网络地址是（&nbsp;&nbsp;）。 
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('886a8d07302549e599273d9fe0e7b534', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497571">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 125.0.0.0</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】125.3.54.56&nbsp;的第一个字节的值在&nbsp;0~127&nbsp;之间，说明是&nbsp;A&nbsp;类地址，其网络号为&nbsp;125.0.0.0。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497572" id="question883497572" data="883497572">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">11. <span
											class="colorShallow">(填空题)</span>IEEE&nbsp;802.3&nbsp;规定了一个数据帧的长度最长为（&nbsp;&nbsp;）字节。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3d73a40af924465cbfa5d25b80a21c13', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497572">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 1518;一千五百一十八</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IEEE&nbsp;802.3&nbsp;规定了一个数据帧的长度最短为&nbsp;64&nbsp;字节，帧能携带的数据最多为&nbsp;1500&nbsp;字节，加上帧头帧尾&nbsp;18&nbsp;字节，最长帧为&nbsp;1518&nbsp;字节。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497573" id="question883497573" data="883497573">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">12. <span
											class="colorShallow">(填空题)</span>IP&nbsp;地址&nbsp;194.55.181.17&nbsp;子网掩码&nbsp;&nbsp;255.255.192.0&nbsp;计算主机号为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0309161ccbab434e935f83c453f3cefb', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497573">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 0.0.53.17;53.17</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】将&nbsp;IP&nbsp;地址与掩码相与得网络地址&nbsp;194.55.128.0，主机号是主机地址减去网络地址，可得&nbsp;0.0.53.17。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497574" id="question883497574" data="883497574">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">13. <span
											class="colorShallow">(填空题)</span>IP&nbsp;报头首部长度的最小值是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1b75b328dd364f85b89ce51ab475bbc6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497574">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 5;五</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;首部长度最小时，只有固定首部，只有&nbsp;5&nbsp;行。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497575" id="question883497575" data="883497575">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">14. <span
											class="colorShallow">(填空题)</span>如果一个&nbsp;IP&nbsp;地址为&nbsp;202.93.120.34&nbsp;的主机需要向&nbsp;202.94.120.0&nbsp;网络进行直接广播，那么，它使用的直接广播地址为（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('073bb61497cb453ba86f134e6a02fa84', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497575">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 202.94.120.255</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】直接广播地址是指包含一个有效的网络号和一个全“1”的主机号，其作用是互联网上的主机向其他网络广播信息。IP&nbsp;地址为&nbsp;202.93.120.34&nbsp;的主机需要向&nbsp;202.94.120.0&nbsp;网络进行直接广播，那么它使用的亢接广播地址为&nbsp;202.94.120.255，互联网上的主机就可以使用该地址向&nbsp;202.94.120.0&nbsp;网络上的所有主机广播。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497576" id="question883497576" data="883497576">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">15. <span
											class="colorShallow">(填空题)</span>TCP/IP&nbsp;参考模型的网络接口层对应于&nbsp;OSI&nbsp;参考模型的物理层与（&nbsp;&nbsp;）层。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6411b4d0249348758e5fdd2a78c2866a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497576">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 数据链路;第2;第二</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP/IP&nbsp;参考模型分为四个层次：应用层（与&nbsp;OSI&nbsp;的应用层对应）、运输层（与&nbsp;OSI&nbsp;的运输层对应）、网际层（与&nbsp;OSI&nbsp;的网络层对应）、主机一网络层（与&nbsp;OSI&nbsp;的数据链路层和物理层对应）。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497577" id="question883497577" data="883497577">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">16. <span
											class="colorShallow">(填空题)</span>局域网所使用的传输介质主要有双绞线、（&nbsp;&nbsp;）、光缆、无线通信信道。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4585d9040e9449c8898e9704ae794cab', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497577">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 同轴电缆</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网所使用的传输介质主要有&nbsp;4&nbsp;种：双绞线、同轴电缆、光缆、无线通信信道。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497578" id="question883497578" data="883497578">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">17. <span
											class="colorShallow">(填空题)</span>网间互联的几种形式有&nbsp;LAN-LAN、LAN-WAN、（&nbsp;&nbsp;）和&nbsp;LAN-WAN-LAN&nbsp;四种。（用大写英文字母表示）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b7c47d9402a448799cdc24e27e5670c8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497578">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) WAN-WAN;广域网与广域网;广域网和广域网</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网间互联的几种形式有&nbsp;LAN-LAN、LAN-WAN、WAN-WAN&nbsp;和&nbsp;LAN-WAN-LAN&nbsp;四种。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497579" id="question883497579" data="883497579">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">18. <span
											class="colorShallow">(填空题)</span>8&nbsp;Mbps&nbsp;等于（&nbsp;&nbsp;）Kbps。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1314c81171c84eaeaab00dda8dcaa4b5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497579">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 8000</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查信息的概念和单位。
<br>速率中&nbsp;K=10³，M=10⁶，G=10⁹，T=10¹²，……
<br>而在信息单位中&nbsp;K=2¹⁰，M=2²⁰，G=2³⁰，T=2⁴⁰，……</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497580" id="question883497580" data="883497580">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">19. <span
											class="colorShallow">(填空题)</span>电子邮件应用程序实现发送邮件的协议是（&nbsp;&nbsp;）。（用大写英文字母表示）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d47bbf039bf843eb8fc0df03171c0887', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497580">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) SMTP;Smtp;smtp</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】电子邮件应用程序在向邮件服务器传送邮件时使用简单邮件传输协议（SimpIe&nbsp;MailTransfer&nbsp;Protocol，SMTP），而从邮件服务器的邮箱中读取时可以使用POP3（Post&nbsp;Offie&nbsp;&nbsp;Protocol）协议或&nbsp;IMAP（Interactive&nbsp;Mail&nbsp;Access&nbsp;Protocol）协议，至于电子邮件应用程序使用何种协议读取邮件则决定于所使用的邮件服务器支持哪一种协议。我们通常称支持&nbsp;POP3&nbsp;协议的邮件服务器为&nbsp;POP3&nbsp;服务器，而称支持&nbsp;IMAP&nbsp;协议的服务器为IMAP服务器。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497581" id="question883497581" data="883497581">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">20. <span
											class="colorShallow">(填空题)</span>主机&nbsp;A&nbsp;向主机&nbsp;B&nbsp;发送&nbsp;TCP&nbsp;报文段，首部中的源端口是&nbsp;m&nbsp;而目的端口是&nbsp;n。当&nbsp;B&nbsp;向&nbsp;A&nbsp;发送回信时，其&nbsp;TCP&nbsp;报文段的首部中源端口是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('effc58cfe0a84bbeac79e9bc72135328', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497581">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) n;N</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】主机&nbsp;A&nbsp;向主机&nbsp;B&nbsp;发送&nbsp;TCP&nbsp;报文段，首部中的源端口是&nbsp;m&nbsp;而目的端口是&nbsp;n。当&nbsp;B&nbsp;向&nbsp;A&nbsp;发送回信时，其&nbsp;TCP&nbsp;报文段的首部中源端口和目的端口将变为目的端口和源端口。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497582" id="question883497582" data="883497582">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">21. <span
											class="colorShallow">(填空题)</span>TCP&nbsp;在进行流量控制和拥塞控制时，发送端的发送窗口上限值应取“接收方窗口”和“拥塞窗口”中较（&nbsp;&nbsp;）的一个。（填大或小）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6aa0de6af6824c02a61926a36667471e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497582">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 小</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;在进行流量控制和拥塞控制时，发送端的发送窗口上限值应取“接收方窗口”和“拥塞窗口”中较小的一个。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497583" id="question883497583" data="883497583">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">22. <span
											class="colorShallow">(填空题)</span>TCP/IP&nbsp;参考模型可以分为：应用层、（&nbsp;&nbsp;）、网际层和网络接口层。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d2b5a8364c28410cb29a17197a6e262e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497583">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 运输层;传输层</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】应用层与&nbsp;OSI&nbsp;应用层对应，运输层与&nbsp;OSI&nbsp;运输层对应，网际层与&nbsp;OSI&nbsp;网络层对应，主机—网络层与&nbsp;OSI&nbsp;数据链路层、物理层对应，TCP/IP&nbsp;参考模型中，对&nbsp;OSI&nbsp;表示层和会话层没有对应的协议。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497584" id="question883497584" data="883497584">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">23. <span
											class="colorShallow">(填空题)</span>网桥可以在互联的多个局域网之间实现数据接收、地址（&nbsp;&nbsp;）与数据转发功能。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f45c6f30b69540b5ab7dcd6578b76b3b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497584">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 过滤</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】网桥是在数据链路层互连的设备，网桥用来实现多个网络系统之间的数据交换，起到数据接收、地址过滤与数据转发的作用。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497585" id="question883497585" data="883497585">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">24. <span
											class="colorShallow">(填空题)</span>IP&nbsp;地址中，如果只是主机号全为&nbsp;1，且网络号不为&nbsp;127&nbsp;时，则表示是（&nbsp;&nbsp;）广播地址。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cb25227584fd444a8c285bf059629015', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497585">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 直接</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;地址中，如果只是主机号全为&nbsp;1，且网络号不为&nbsp;127&nbsp;时，则表示是直接广播地址。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497586" id="question883497586" data="883497586">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">25. <span
											class="colorShallow">(填空题)</span>电子邮件由两部分组成：信封和（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bde084dd5dd2421ba15a95295b9dd88f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497586">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 内容</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】电子邮件由信封和内容两部分组成。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497587" id="question883497587" data="883497587">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">26. <span
											class="colorShallow">(填空题)</span>在&nbsp;MAC&nbsp;帧结构中，数据区的范围处在（&nbsp;&nbsp;）字节至&nbsp;1500&nbsp;字节之间。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e470bd4e9e1f40289a45db82d120fb4d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497587">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 46;四十六</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;MAC&nbsp;帧结构中，帧头加帧尾共&nbsp;18&nbsp;个字节，而最小帧为&nbsp;64&nbsp;字节，因此，数据区的范围处在&nbsp;46~1500&nbsp;字节之间。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497588" id="question883497588" data="883497588">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">27. <span
											class="colorShallow">(填空题)</span>网络传输介质中性能最好、应用前途最广泛的一种是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fd5304e69a634ab2b45c5cefe38e1733', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497588">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 光缆;光纤</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】光纤具有低损耗、宽频带、高数据传输速率、低误码率与安全保密性好的特点，因此是一种最有前途的传输介质。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497589" id="question883497589" data="883497589">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">28. <span
											class="colorShallow">(填空题)</span>IP&nbsp;地址&nbsp;192.168.12.72，子网掩码为：255.255.255.192，该地址所在网段的网络地址（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4e3d522baccf44d0aa0b9056424e75c3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497589">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 192.168.12.64</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;地址与掩码相与得网络地址&nbsp;192.168.12.64。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497590" id="question883497590" data="883497590">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">29. <span
											class="colorShallow">(填空题)</span>2&nbsp;MB&nbsp;等于（&nbsp;&nbsp;）KB。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('957e55490ebd4304afef643c472c3328', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497590">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 2048</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查信息的概念和单位。
<br>速率中&nbsp;K=10³，M=10⁶，G=10⁹，T=10¹²，……
<br>而在信息单位中&nbsp;K=2¹⁰，M=2²⁰，G=2³⁰，T=2⁴⁰，……</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497591" id="question883497591" data="883497591">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">30. <span
											class="colorShallow">(填空题)</span>IP&nbsp;报头首部长度的最大值是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c945cc461cb149c0bc8c6b133002c397', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497591">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 15;十五</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;首部长度占&nbsp;4&nbsp;位，最大为&nbsp;15，其最大的报头长度为&nbsp;15*4=60&nbsp;字节。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497592" id="question883497592" data="883497592">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">31. <span
											class="colorShallow">(填空题)</span>IP&nbsp;报头的最小长度是（&nbsp;&nbsp;）字节。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('61a53c889c21477882dbc64690898ca2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497592">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 20;二十</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;首部长度最小时，只有固定首部，长度为&nbsp;20&nbsp;字节。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497593" id="question883497593" data="883497593">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">32. <span
											class="colorShallow">(填空题)</span>1&nbsp;Gbps&nbsp;等于（&nbsp;&nbsp;）Mbps。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('792ba3f865c24aa29510970ded726ab8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497593">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 1000</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查信息的概念和单位。
<br>速率中&nbsp;K=10³，M=10⁶，G=10⁹，T=10¹²，……
<br>而在信息单位中&nbsp;K=2¹⁰，M=2²⁰，G=2³⁰，T=2⁴⁰，……</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497594" id="question883497594" data="883497594">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">33. <span
											class="colorShallow">(填空题)</span>一个路由器的路由表如下所示。如果该路由器接收到一个目的&nbsp;IP&nbsp;地址为&nbsp;101.1.2.5&nbsp;的报文，那么它应该将其投递到（&nbsp;&nbsp;）。<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一路由器<BR>101.2.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>101.3.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>101.1.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.7.1.5<BR>101.4.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.6.2.7
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('ca77b97c54f54d2783bddf9daae02678', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497594">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 10.7.1.5</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】将目的&nbsp;IP&nbsp;地址&nbsp;101.1.2.5&nbsp;与除默认路由外的每个路由项目的子网掩码进行与运算，用得到的网络地址与本项的目的网络进行比较，记录所有的匹配项目，找出其中的最长匹配项目，交给对应的下一跳转发，否则，交由默认路由去转发。
<br>项目1：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;101.1.0.0，与目的网络&nbsp;101.2.0.0&nbsp;&nbsp;不匹配
<br>项目2：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;101.1.0.0，与目的网络&nbsp;101.3.0.0&nbsp;&nbsp;不匹配
<br>项目3：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;101.1.0.0，与目的网络&nbsp;101.1.0.0&nbsp;&nbsp;匹配
<br>项目4：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;101.1.0.0，与目的网络&nbsp;101.4.0.0&nbsp;&nbsp;不匹配
<br>通过四个项目的比较，只有第三个项目的网络与计算出的网络匹配，交给项目三的下一跳进行投递，即将报文直接投递到&nbsp;10.7.1.5。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497595" id="question883497595" data="883497595">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">34. <span
											class="colorShallow">(填空题)</span>IP&nbsp;地址&nbsp;111.181.21.9，子网掩码&nbsp;255.192.0.0&nbsp;的直接广播地址是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c608db9a20e546c78cd4eec906779600', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497595">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 111.191.255.255</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】由于子网掩码为&nbsp;255.192.0.0，把它与&nbsp;IP&nbsp;地址&nbsp;111.181.21.9&nbsp;进行相与得网络地址为&nbsp;111.128.0.0；
<br>直接广播地址是针对对应的网络号&nbsp;111.128.0.0&nbsp;其主机号全为&nbsp;1&nbsp;的地址，计算得&nbsp;111.191.255.255。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497596" id="question883497596" data="883497596">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">35. <span
											class="colorShallow">(填空题)</span>一个路由器的两个&nbsp;IP&nbsp;地址为&nbsp;120.0.0.6&nbsp;和&nbsp;130.0.0.6，其路由表如下所示。当收到源&nbsp;IP&nbsp;地址为&nbsp;140.0.0.8，目的&nbsp;IP&nbsp;地址为&nbsp;120.0.0.1&nbsp;的数据报时，它将把此数据报投递到（&nbsp;&nbsp;）。<BR>要到达的网络&nbsp;&nbsp;下一路由器<BR>120.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>130.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>110.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;120.0.0.5<BR>140.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;130.0.0.7
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4e7adf96a28e45478c35236ed9ea3804', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497596">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 120.0.0.1</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】目的地址属于&nbsp;120.0.0.0&nbsp;网段，根据路由表，可以接投递。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497597" id="question883497597" data="883497597">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">36. <span
											class="colorShallow">(填空题)</span>数据传输的技术有两种：（&nbsp;&nbsp;）传输和异步传输。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a8a994466f9e4d33a2cbf1da258f87fe', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497597">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 同步</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据传输的技术一般分为：同步传输和异步传输两种。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497598" id="question883497598" data="883497598">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">37. <span
											class="colorShallow">(填空题)</span>Ethernet&nbsp;V2.0&nbsp;规定帧的数据字段的最大长度是（&nbsp;&nbsp;）字节。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fb8c5c23accd49739eff4f92ef92a337', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497598">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 1500;一千五百</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】Ethemet&nbsp;V2.0&nbsp;类型以太网帧的最小长度为&nbsp;6+5+2+46+4=64&nbsp;字节，最大长度为&nbsp;6+6+2+1500+4=1518&nbsp;字节，数据部分的长度范围为&nbsp;46～1500&nbsp;B，故数据字段的最大长度为&nbsp;1500&nbsp;B。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497599" id="question883497599" data="883497599">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">38. <span
											class="colorShallow">(填空题)</span>在&nbsp;TCP&nbsp;的结构中，其头部有一个字段用来标识不同的应用进程，这个字段是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('421be9cfe2b84995b3e2a2fd75ed9526', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497599">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 序号;seq;Seq;SEQ</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;TCP&nbsp;的结构中，序号字段用来标识不同的应用进程。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497600" id="question883497600" data="883497600">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">39. <span
											class="colorShallow">(填空题)</span>在&nbsp;TCP/IP&nbsp;网络中，FTP&nbsp;协议工作在（&nbsp;&nbsp;）层。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7ca41f128d1c46aaad2adf7164aa5f72', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497600">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 应用;最高;第4;第四</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;TCP/IP&nbsp;网络中，FTP&nbsp;协议是应用层协议，它工作在应用层。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497601" id="question883497601" data="883497601">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">40. <span
											class="colorShallow">(填空题)</span>网段地址&nbsp;154.27.0.0&nbsp;的网络，若不做子网划分，最多能支持（&nbsp;&nbsp;）台主机同时上网。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bffd6271cdc4411bad44cebd9fda09af', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497601">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 2¹⁶-2;65534</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】154.27.0.0&nbsp;为&nbsp;B&nbsp;类网络，它有&nbsp;16&nbsp;位主机号，IP&nbsp;地址个数为&nbsp;2¹⁶=65536，能应用的&nbsp;IP&nbsp;地址要除去全为“0”和全为“1”的两个特殊地址，因此，最多能支持的主机数为&nbsp;65534。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497602" id="question883497602" data="883497602">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">41. <span
											class="colorShallow">(填空题)</span>TCP&nbsp;传输的可靠性是由于使用了（&nbsp;&nbsp;）机制。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0e47c70c3932445c904dda2ecc6d182b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497602">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 重传和确认;确认和重传;重传与确认;确认与重传</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i><p>【解析】TCP&nbsp;传输的可靠性是由于使用了重传和确认机制。</p></div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497603" id="question883497603" data="883497603">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">42. <span
											class="colorShallow">(填空题)</span>4&nbsp;Kb&nbsp;等于（&nbsp;&nbsp;）b。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8f0d24c7467343b7b42cb49412ae1150', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497603">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 4096</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】考查信息的概念和单位。
<br>速率中&nbsp;K=10³，M=10⁶，G=10⁹，T=10¹²，……
<br>而在信息单位中&nbsp;K=2¹⁰，M=2²⁰，G=2³⁰，T=2⁴⁰，……</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497604" id="question883497604" data="883497604">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">43. <span
											class="colorShallow">(填空题)</span>一个帧能最多携带的数据为（&nbsp;&nbsp;）字节。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f261250c78bc43fa9e24eb779b864b0d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497604">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 1500;一千五百</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】一个帧能最多携带的数据为&nbsp;1500&nbsp;字节。。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497605" id="question883497605" data="883497605">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">44. <span
											class="colorShallow">(填空题)</span>下表为一路由器的路由表。如果该路由器接收到源地址为&nbsp;10.2.56.29、目的地址为&nbsp;10.3.1.28&nbsp;的&nbsp;IP&nbsp;数据报，那么它将把该数据报投递到（&nbsp;&nbsp;）。<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一路由器<BR>10.2.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>10.3.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>10.0.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;10.2.0.5<BR>10.4.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;10.3.0.7
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4326d1325b764411b0779c63a4a243a9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497605">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 10.3.1.28</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】将目的&nbsp;IP&nbsp;地址&nbsp;10.3.1.28&nbsp;与除默认路由外的每个路由项目的子网掩码进行与运算，用得到的网络地址与本项的目的网络进行比较，记录所有的匹配项目，找出其中的最长匹配项目，交给对应的下一跳转发，否则，交由默认路由去转发。
<br>项目1：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.3.0.0，与目的网络&nbsp;10.2.0.0&nbsp;&nbsp;不匹配
<br>项目2：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.3.0.0，与目的网络&nbsp;10.3.0.0&nbsp;&nbsp;匹配
<br>项目3：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.3.0.0，与目的网络&nbsp;10.0.0.0&nbsp;&nbsp;不匹配
<br>项目4：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.3.0.0，与目的网络&nbsp;10.4.0.0&nbsp;&nbsp;不匹配
<br>通过四个项目的比较，只有第二个项目的网络与计算出的网络匹配，交给项目进行直接投递，即由路由器将报文直接投递到目的地址&nbsp;10.3.1.28。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497606" id="question883497606" data="883497606">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">45. <span
											class="colorShallow">(填空题)</span>如果一个&nbsp;IP&nbsp;地址为&nbsp;202.93.120.34&nbsp;的主机向&nbsp;IP&nbsp;为&nbsp;255.255.255.255&nbsp;的地址发送数据，这种做法称为（&nbsp;&nbsp;）广播。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d6dadb50bc8c424e93569e064d98e48f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497606">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 有限;受限</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】255.255.255.255&nbsp;为有限广播地址。向&nbsp;255.255.255.255&nbsp;发送数据为向本网主机进行广播，而本网广播又可称为有限广播。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497607" id="question883497607" data="883497607">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">46. <span
											class="colorShallow">(填空题)</span>在文件传输服务中，将文件从服务器传到客户机称为（&nbsp;&nbsp;）文件。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6a68102d7f28456a9195a6a57b2447f1', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497607">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 下载</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在文件传输服务中，将文件从服务器传到客户机称为下载文件。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497608" id="question883497608" data="883497608">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">47. <span
											class="colorShallow">(填空题)</span>一个路由器的两个&nbsp;IP&nbsp;地址为&nbsp;20.0.0.6&nbsp;和&nbsp;30.0.0.6，其路由表如下所示。当收到源&nbsp;IP&nbsp;地址为&nbsp;40.0.0.8、目的&nbsp;IP&nbsp;地址为&nbsp;20.0.0.1&nbsp;的数据报时，它将把此数据报投递到（&nbsp;&nbsp;）。<BR>要到达的网络&nbsp;&nbsp;下一路由器<BR>20.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>30.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>10.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;20.0.0.5<BR>40.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;30.0.0.7
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('34e7cab5e32b443ebe545bd88d4c59de', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497608">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 20.0.0.1</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】一个路由表通常包含许多（N，R）对序偶，其中&nbsp;N&nbsp;是目的网络的&nbsp;IP&nbsp;地址，R&nbsp;是网络&nbsp;N&nbsp;路径上的“下一个”路由器的&nbsp;IP&nbsp;地址。本题中，目的&nbsp;IP&nbsp;地址为&nbsp;20.0.0.1，属于&nbsp;A&nbsp;类网络地址，其网络地址为&nbsp;20.0.0.0，因此路由器收到该&nbsp;IP&nbsp;数据包后按照路由表的第一个（N，R）对序偶选择下一路由为“直接投递”，即直接投递给接收主机，因此投递的&nbsp;IP&nbsp;地址为&nbsp;20.0.0.1。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497609" id="question883497609" data="883497609">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">48. <span
											class="colorShallow">(填空题)</span>如果某主机&nbsp;IP&nbsp;地址为&nbsp;192.168.182.12，子网屏蔽码为&nbsp;255.255.192.0，那么该主机所在的网络地址是（&nbsp;&nbsp;）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8bfc120c3b6146b59d7ea17d4f033153', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497609">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 192.168.128.0</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】子网屏蔽码与主机&nbsp;IP&nbsp;地址进行“与”运算，得到的结果就是网络地址为&nbsp;192.168.128.0。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497610" id="question883497610" data="883497610">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">49. <span
											class="colorShallow">(填空题)</span>数据通信可分为同步通信和（&nbsp;&nbsp;）通信两大类。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('32bace6179114af3b53992c66ee8a9ed', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497610">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 异步</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】数据通信可分为同步通信和异步通信两大类。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497611" id="question883497611" data="883497611">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">50. <span
											class="colorShallow">(填空题)</span>IP&nbsp;报头的最大长度是（&nbsp;&nbsp;）字节。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('77b785adada2406687fc548726583f75', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497611">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 60;六十</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】IP&nbsp;首部长度占&nbsp;4&nbsp;位，最大为&nbsp;15，其最大的报头长度为&nbsp;15*4=60&nbsp;字节。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
											
						
						<h2 tabindex="0" role="option" class="type_tit">三. 判断题（共50
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497612" id="question883497612" data="883497612">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(判断题)</span>对于主机域名&nbsp;for.zj.edu.cn&nbsp;来说，其中&nbsp;cn&nbsp;表示主机名。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e2bd605ad2054f758ed55942d7e45c9b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】对于主机域名&nbsp;for.zj.edu.cn&nbsp;来说，其中&nbsp;cn&nbsp;表示中国顶级域名。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497613" id="question883497613" data="883497613">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(判断题)</span>在共享介质的局域网中，采&nbsp;CSMA/CD&nbsp;介质访问控制方法，多结点“冲突”的现象是可避免的。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('56ffc5c26f3446e08f87fda26c3b3c3b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在共享介质的局域网中，采&nbsp;CSMA/CD&nbsp;介质访问控制方法，多结点“冲突”的现象是不可避免的。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497614" id="question883497614" data="883497614">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(判断题)</span>在互联网中，人们通过&nbsp;WWW&nbsp;浏览器观看到的网站的第一个页面称为主页。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4513b7f37b3545e7aaf7088cc77840a5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497615" id="question883497615" data="883497615">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(判断题)</span>从拓扑结构上看，互联网可以划分为边缘部分和核心部分两大块。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a33bee84e243474ebf6ac8cb7a83114d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】从工作方式上看，互联网可以划分为边缘部分和核心部分两大块。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497616" id="question883497616" data="883497616">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(判断题)</span>当路由器接收到一个目的地址为&nbsp;191.1.255.255&nbsp;的分组时，路由器将这个分组以广播方式传送给&nbsp;191.1.0.0&nbsp;网络上的所有主机。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6cc60866000744fea6f39c69b1b6e9e8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497617" id="question883497617" data="883497617">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">6. <span
											class="colorShallow">(判断题)</span>按数据传送技术划分，交换网络可分为电路交换&nbsp;、报文交换和分组交换。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('9747478716924462be66a4f8d54caba0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497618" id="question883497618" data="883497618">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">7. <span
											class="colorShallow">(判断题)</span>TCP&nbsp;和&nbsp;UDP&nbsp;都有复用和分用，以及检错的功能。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0ce05a5ff2a647d8bf3ff1a7992be017', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497619" id="question883497619" data="883497619">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">8. <span
											class="colorShallow">(判断题)</span>Ethernet&nbsp;交换机实质上就是一个多接口的集线器（Hub）。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5a80c966261248bc9491c09ba14c3cee', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】Ethernet&nbsp;交换机实质上就是一个多接口的透明网桥。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497620" id="question883497620" data="883497620">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">9. <span
											class="colorShallow">(判断题)</span>吉比特网（1&nbsp;Gbps&nbsp;Ethernet）只工作在全双工方式，不存在争用问题，依然使用&nbsp;CSMA/CD&nbsp;协议，这使其传输距离不受冲突检测的限制。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a973cc7edebf4f9daddf052dd27c0b7f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】万兆以太网（10&nbsp;Gbps&nbsp;Ethernet）只工作在全双工方式，因此不存在争用问题，不使用&nbsp;CSMA/CD&nbsp;协议，这使其传输距离不受冲突检测的限制。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497621" id="question883497621" data="883497621">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">10. <span
											class="colorShallow">(判断题)</span>在光纤中传输的光信号采用的复用技术是&nbsp;STDM。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('58087b504f5845fbb1089aa9e788bb21', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在光纤中传输的光信号采用的复用技术是&nbsp;WDM。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497622" id="question883497622" data="883497622">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">11. <span
											class="colorShallow">(判断题)</span>网桥在网络层实现网络的互联。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('ba0971ecf98d4dfea761e0bf5b2ed6ad', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】路由器在网络层实现网络的互联。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497623" id="question883497623" data="883497623">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">12. <span
											class="colorShallow">(判断题)</span>TCP&nbsp;是无连接的运输层协议。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2370bf3859164c66862fdd1f55875120', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;是面向连接的运输层协议。或者：UDP&nbsp;是无连接的运输层协议。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497624" id="question883497624" data="883497624">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">13. <span
											class="colorShallow">(判断题)</span>停止等待&nbsp;ARQ&nbsp;协议的接收方一般都是采用累计确认的方式。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8a7c323397124a62a9e4047e6d01f7ef', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】连续&nbsp;ARQ&nbsp;协议的接收方一般都是采用累计确认的方式。若&nbsp;TCP&nbsp;首部确认号为&nbsp;n，则表明到序号&nbsp;n-1&nbsp;及以前的所有数据都已经正确收到。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497625" id="question883497625" data="883497625">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">14. <span
											class="colorShallow">(判断题)</span>局域网常用的传输介质有：同轴电缆、双绞线、光纤与无线通信信道。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c46762ff75e24277915a622e3ef07a65', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】局域网常用的传输介质有：同轴电缆、双绞线、光纤与无线通信信道。早期应用最多的是同轴电缆。随着技术发展，双绞线与光纤的应用发展十分迅速。目前；在覆盖范围比较小的局域网中使用双绞线，在远距离传输中使用光纤，在有移动结点的局域网中采用无线技术的趋势已经明朗。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497626" id="question883497626" data="883497626">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">15. <span
											class="colorShallow">(判断题)</span>使用&nbsp;CSMA/CD&nbsp;的&nbsp;Ethernet&nbsp;可以进行全双工通信。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('881ad1a578bf4ca283927158ffa031c0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】使用&nbsp;CSMA/CD&nbsp;的&nbsp;Ethernet&nbsp;只能进行半双工通信。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497627" id="question883497627" data="883497627">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">16. <span
											class="colorShallow">(判断题)</span>运输层的协议数据单元是分组。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('34f028f3c7504e1bb517ebc8094abbfe', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】运输层负责对无误数据的确认，通过重新传输出错的数据，来确保信息的可靠传递，它位于应用层和网络层之间。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497628" id="question883497628" data="883497628">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">17. <span
											class="colorShallow">(判断题)</span>电子邮件服务具时实性强的优点。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('23059cc3a918404b9bdd9a076e8e9a7d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】电子邮件服务具时方便迅速、价格低廉和信息量大的优点。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497629" id="question883497629" data="883497629">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">18. <span
											class="colorShallow">(判断题)</span>HTTP&nbsp;是&nbsp;WWW&nbsp;上用于创建超文本链接的语言。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3d21e7fb4e7c4d2485c4dadaf13f53d0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】HTTP&nbsp;是&nbsp;WWW&nbsp;网上的超文本传输协议。HTML&nbsp;是&nbsp;WWW&nbsp;上用于创建超文本链接的语言。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497630" id="question883497630" data="883497630">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">19. <span
											class="colorShallow">(判断题)</span>当路由器接收到一个目的地址为&nbsp;188.10.255.255&nbsp;的分组时，路由器将这个分组以广播方式传送给&nbsp;188.10.0.0&nbsp;网络上的所有主机。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e8c2a3d40d4047c0ab22d98a3aa0c743', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497631" id="question883497631" data="883497631">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">20. <span
											class="colorShallow">(判断题)</span>IP&nbsp;报文格式中的总长度包含头部长度和数据区长度。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('77bccc8ad2ca4d49b0c6ab0fc94e18ee', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497632" id="question883497632" data="883497632">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">21. <span
											class="colorShallow">(判断题)</span>以太网采用面向连接的工作方式，对发送的数据帧不编号，也不要求对方发回确认。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c111711753fa471d9623c54a923e4991', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】以太网采用无连接的工作方式，对发送的数据帧不编号，也不要求对方发回确认。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497633" id="question883497633" data="883497633">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">22. <span
											class="colorShallow">(判断题)</span>IP&nbsp;包的&nbsp;TTL&nbsp;值减为&nbsp;0&nbsp;时路由器发出“超时”报文。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a577aaf64a8540ee9cb2a66435e1e539', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497634" id="question883497634" data="883497634">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">23. <span
											class="colorShallow">(判断题)</span>在&nbsp;IP&nbsp;地址应用中，主机号的位全为&nbsp;1&nbsp;时，只能作为目的&nbsp;IP&nbsp;地址使用。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c74c7f9e6f014768aff744fa062397b5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497635" id="question883497635" data="883497635">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">24. <span
											class="colorShallow">(判断题)</span>HTTP&nbsp;是超文本标记语言。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('e4efd8b684a64bce9cce9a0b4d143d5d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】HTTP&nbsp;是&nbsp;WWW&nbsp;网上的超文本传输协议。HTML&nbsp;是&nbsp;WWW&nbsp;上用于创建超文本链接的语言。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497636" id="question883497636" data="883497636">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">25. <span
											class="colorShallow">(判断题)</span>双绞线不仅可以传输数字信号，也可以传输模拟信号。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('20dfde1e84d14e2faca3ee15b67dcc13', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497637" id="question883497637" data="883497637">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">26. <span
											class="colorShallow">(判断题)</span>在计算机网络的五层协议体系结构中，路由选择功能是运输层的功能。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('de675ea0a93e4ff7ac6553210d70fd15', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在计算机网络的五层协议体系结构中，路由选择功能是网络层的功能。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497638" id="question883497638" data="883497638">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">27. <span
											class="colorShallow">(判断题)</span>UDP&nbsp;是面向连接的运输层协议。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b890dfd3f1134c26bcb4fe94f705958f', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;是面向连接的运输层协议。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497639" id="question883497639" data="883497639">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">28. <span
											class="colorShallow">(判断题)</span>以太网交换机中的端口/MAC&nbsp;地址映射表是由网络管理员建立的。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('8e799bbecad04a1a86e2197bc7ebe40b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】以太网交换机中的端口/MAC&nbsp;地址映射表是自学习建立的。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497640" id="question883497640" data="883497640">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">29. <span
											class="colorShallow">(判断题)</span>互联网中接收邮件协议是&nbsp;SMTP。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('427cfb3f02ca4c8387616068b3ec7d81', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】互联网中，发送邮件有协议是&nbsp;SMTP，而接收邮件协议是&nbsp;POP3&nbsp;或&nbsp;IMAP。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497641" id="question883497641" data="883497641">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">30. <span
											class="colorShallow">(判断题)</span>停等协议是&nbsp;ARQ&nbsp;协议中最简单的协议。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cc562cfd9e674d6fb32070696139d892', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497642" id="question883497642" data="883497642">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">31. <span
											class="colorShallow">(判断题)</span>若&nbsp;TCP&nbsp;首部确认号为&nbsp;n，则表明到序号&nbsp;n&nbsp;为止的所有数据都已经收到。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('a125f3c712fd4edd850bc60119239f18', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】使用确认和重传机制即可在不可靠的传输网络上实现可靠的通信。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497643" id="question883497643" data="883497643">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">32. <span
											class="colorShallow">(判断题)</span>若网络号与主机号的&nbsp;32&nbsp;位全&nbsp;1&nbsp;的&nbsp;IP&nbsp;地址即&nbsp;255.255.255.255&nbsp;是直接广播地址。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6403aa546ab541eea3e85cd58c6e8cb7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】若网络号与主机号的&nbsp;32&nbsp;位全&nbsp;1&nbsp;的&nbsp;IP&nbsp;地址即&nbsp;255.255.255.255&nbsp;是本网广播地址或受限广播地址。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497644" id="question883497644" data="883497644">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">33. <span
											class="colorShallow">(判断题)</span>交换机实现的是&nbsp;OSI&nbsp;参考模型的选择最佳传输路由、流量控制及网络管理功能。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5f35b6e160d54c2ab385b874bbc863fe', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】路由器实现的是&nbsp;OSI&nbsp;参考模型的选择路由的功能。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497645" id="question883497645" data="883497645">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">34. <span
											class="colorShallow">(判断题)</span>根据连续&nbsp;ARQ&nbsp;协议的原理，当传输信道质量很差因而误码率较大时，连续&nbsp;ARQ&nbsp;协议不一定优于停止等待协议。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('97680686cc9b42e8a0702fe016a3d54b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497646" id="question883497646" data="883497646">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">35. <span
											class="colorShallow">(判断题)</span>21&nbsp;世纪的一些重要特征就是数字化、网络化和信息化，它是一个以网络为核心的信息时代。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5744cf3001c34c209e8cbaa2ca999c9d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497647" id="question883497647" data="883497647">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">36. <span
											class="colorShallow">(判断题)</span>在互联网上使用域名是由于&nbsp;IP&nbsp;地址是数字编码，不易记忆。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('02a9852970294049a6185a6867e812a0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497648" id="question883497648" data="883497648">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">37. <span
											class="colorShallow">(判断题)</span>CSMA/CD&nbsp;在网络通信负荷较大时表现出较好的吞吐率与延迟特性。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('58dcb992832143358256ba39e1934ce5', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在采用&nbsp;CSMA/CD&nbsp;的以太网中，多个结点共享一条公用通信信道，所以当网络结点数增加，网络负荷加重时，冲突和重发现象将大量发生，网络效率急剧下降，所以采用&nbsp;CSMA/CD&nbsp;介质访问控制方法的局域网适用于办公自动化环境。这类局域网在网络通信负荷较低的情况下表现出较好的吞吐率与延迟特性。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497649" id="question883497649" data="883497649">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">38. <span
											class="colorShallow">(判断题)</span>互联网上为用户之间发送和接收信息提供的一种快速、廉价的现代化通信手段称为电子邮件服务。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3c93f9fe956240588f3e818ac23dd066', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497650" id="question883497650" data="883497650">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">39. <span
											class="colorShallow">(判断题)</span>某用户在&nbsp;WWW&nbsp;浏览器地址栏内键入了一个&nbsp;URL：http：//www.dlut.edu.cn/in-dex.htm，其中“http：//”代表文件名。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('448526ea701f41d69de2c6331ef200dd', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】某用户在&nbsp;WWW&nbsp;浏览器地址栏内键入了一个&nbsp;URL&nbsp;中，“http：//”代表协议类型。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497651" id="question883497651" data="883497651">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">40. <span
											class="colorShallow">(判断题)</span>TCP/IP&nbsp;协议中，TCP&nbsp;提供可靠的面向连接服务，UDP&nbsp;提供简单的无连接服务，应用层服务建立在该服务之上。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('928fbb547fc74c50941a3f9f0dd26d5a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497652" id="question883497652" data="883497652">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">41. <span
											class="colorShallow">(判断题)</span>停止等待协议和连续&nbsp;ARQ&nbsp;协议说明了可靠传输的工作原理。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('922c50bf61ae4c22be611a64d36e2b12', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497653" id="question883497653" data="883497653">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">42. <span
											class="colorShallow">(判断题)</span>通常情况下，一封电子邮件的发送需要经过用户代理、传输代理和投递代理等&nbsp;3&nbsp;个程序的参与。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('28d322ae8a86498a97212b75b61edc46', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497654" id="question883497654" data="883497654">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">43. <span
											class="colorShallow">(判断题)</span>TCP&nbsp;连接建立时会约定双方数据传输速率。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b7459f4ad7b94d3aa4705164b1148437', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】TCP&nbsp;连接建立时不会约定双方数据传输速率，传输速率是不恒定的。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497655" id="question883497655" data="883497655">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">44. <span
											class="colorShallow">(判断题)</span>网桥能够互连两个采用不同数据链路层协议、不同传输介质与不同传输速率的局域网。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('75323e17901341318a606843af01f353', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497656" id="question883497656" data="883497656">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">45. <span
											class="colorShallow">(判断题)</span>一台运行&nbsp;TCP/IP&nbsp;协议的主机可能同时运行不同的应用层协议和应用程序。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('210abce73aa2425db0613e6a421ff647', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497657" id="question883497657" data="883497657">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">46. <span
											class="colorShallow">(判断题)</span>互联网的域名系统&nbsp;DNS&nbsp;是一个联机分布式数据库系统。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1f9802c2ff4246ff82c4169fbca7580d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497658" id="question883497658" data="883497658">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">47. <span
											class="colorShallow">(判断题)</span>在&nbsp;A、B、C&nbsp;三类&nbsp;IP&nbsp;地址中主机标识标识全为&nbsp;1&nbsp;的&nbsp;IP&nbsp;地址是受限广播地址。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f64f77634d8b4f898cd20566947c3d3c', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】在&nbsp;A、B、C&nbsp;三类&nbsp;IP&nbsp;地址中主机标识全为&nbsp;1&nbsp;的&nbsp;IP&nbsp;地址是直接广播地址。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497659" id="question883497659" data="883497659">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">48. <span
											class="colorShallow">(判断题)</span>一个&nbsp;URL&nbsp;地址：http：//www.csai.cn/docs/index.html，www.csai.cn/docs&nbsp;标识了要访问的域名。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('37daa4a123d240a09b062a262c7eaacb', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】一个&nbsp;URL&nbsp;地址：http：//www.csai.cn/docs/index.html，www.csai.cn/docs&nbsp;标识了要访问的域名与文件夹。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497660" id="question883497660" data="883497660">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">49. <span
											class="colorShallow">(判断题)</span>二进制指数退避算法解决了站点是如何对冲突进行检测。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('3e056b8e04174c3c9462566573aebda7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 错
                                                </span>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>【解析】二进制指数退避算法解决的是站点检测到冲突后延迟发送的时间。</div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497661" id="question883497661" data="883497661">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">50. <span
											class="colorShallow">(判断题)</span>如今，互联网就是世界上最大的计算机网络。（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('abc7f64d7b8c40fc8ec3b0116526f2e4', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<ul class="mark_letter colorDeep">
    <li tabindex="0" role="option" >A. 对</li>
    <li tabindex="0" role="option" >B. 错</li>
</ul>
<div class="mark_answer">
    <div class="mark_key clearfix" tabindex="0" role="option" >
        <span class="colorDeep marginRight40 fl"><i class="fontWeight">我的答案:</i> </span>
                    <span class="colorGreen marginRight40 fl">
                                                            <i class="fontWeight">正确答案:</i> 对
                                                </span>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
    <div class="mark_score"  >
                
            </div>
</div>															</div>
											
						
						<h2 tabindex="0" role="option" class="type_tit">四. 简答题（共20
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497662" id="question883497662" data="883497662">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(简答题)</span>假设发送一个&nbsp;1&nbsp;GB&nbsp;的数据文件，信号在媒体上的传播速率为&nbsp;2*10⁸&nbsp;m/s，媒体长度&nbsp;2000&nbsp;Km&nbsp;时，当带宽为&nbsp;1&nbsp;Mb/s&nbsp;和&nbsp;10&nbsp;Gb/s&nbsp;时，分别求数据的传播时延和最少传输时延。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0d2712f6a2734dfb8e13949f65702327', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497662"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：（1）带宽为&nbsp;1&nbsp;Mb/s<BR>传播时延=传播距离/传播速率=2000*1000/（2*10⁸）&nbsp;=&nbsp;0.01&nbsp;s<BR>最少传输时延=信息量/发送速率=2³⁰&nbsp;*&nbsp;8/10⁶&nbsp;≈&nbsp;10⁹&nbsp;*&nbsp;8/10⁶&nbsp;=&nbsp;8000&nbsp;s<BR>（2）带宽为&nbsp;1&nbsp;Gb/s<BR>传播时延=传播距离/传播速率=2000*1000/（2*10⁸）&nbsp;=&nbsp;0.01&nbsp;s<BR>最少传输时延=信息量/发送速率=2³⁰&nbsp;*&nbsp;8/（10*10⁹）&nbsp;≈&nbsp;10⁹&nbsp;*&nbsp;8/10¹⁰&nbsp;=&nbsp;0.8&nbsp;s&nbsp;&nbsp;（1分/个）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497663" id="question883497663" data="883497663">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(简答题)</span>某企业分配给产品部、市场部和财务部的&nbsp;IP&nbsp;地址块分别为&nbsp;10.16.31.192/26、10.16.31.160/27&nbsp;和&nbsp;10.16.31.128/27，求这三个地址块经聚合后的地址块。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('cc76fb0fad814c6395e2e7f6c411cefa', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497663"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：如果要聚合&nbsp;1&nbsp;位地址的两个地址块，需要满足三个条件：<BR>（1）地址块大小相同；<BR>（2）要聚合的位一个为&nbsp;0，另一个为&nbsp;1；<BR>（3）聚合位的前面位必须全部相同。&nbsp;（2分）<BR>将&nbsp;2&nbsp;个大小相同的地址块的第&nbsp;4&nbsp;段转换为二进制数：<BR>128=（10000000）<BR>160=（10100000）<BR>通过比较可知：满足以上三个条件，聚合为&nbsp;10.16.31.128/26；<BR>同理，再将聚合后的&nbsp;10.16.31.128/26&nbsp;与&nbsp;10.16.31.192/26&nbsp;进行聚合为&nbsp;10.16.31.128/25。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497664" id="question883497664" data="883497664">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(简答题)</span>若&nbsp;IP&nbsp;分组的总长度为&nbsp;1000&nbsp;B，所携带数据&nbsp;968&nbsp;B，其首部长度字段为多少？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2ea63ff89bb74434b2f7061f9bc77621', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497664"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：IP&nbsp;分组结构中，总长度为&nbsp;1000&nbsp;B，携带数据为&nbsp;968&nbsp;B，首部占&nbsp;1000-968=32&nbsp;B&nbsp;&nbsp;（2分）<BR>其首部字段的值为&nbsp;32/4=8。（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497665" id="question883497665" data="883497665">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(简答题)</span>一个无噪声的话音带宽为&nbsp;6000&nbsp;Hz，采用&nbsp;8&nbsp;相调制解调器传送二进制信号，求能传送数据的速率为多少？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('6b381f99f6b748df9b25e2e22cc82397', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497665"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由奈氏定理可知：（2分）<BR>Cmax&nbsp;=2W*&nbsp;㏒₂（V）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=2*6000*㏒₂（8）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=36&nbsp;Kb/s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497666" id="question883497666" data="883497666">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(简答题)</span>若一条信道的带宽为&nbsp;8&nbsp;K，其信号的电平级数为&nbsp;16&nbsp;级，信噪比为&nbsp;30&nbsp;分贝，在该信道上的最大传输率是多大？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5ae5f0c68e324f188c4a55caec6531ba', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497666"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由单位换算可知：30&nbsp;dB&nbsp;的信噪比相当于&nbsp;S/N=1000&nbsp;&nbsp;（2分）<BR>由香农定理可知：Cmax=W*㏒₂（1+S/N）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=8000*㏒₂（1+1000）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;≈80&nbsp;Kb/s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497667" id="question883497667" data="883497667">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">6. <span
											class="colorShallow">(简答题)</span>要发送的数据为&nbsp;11101110。采用&nbsp;CRC&nbsp;的生成多项式是&nbsp;P（x）=x⁴&nbsp;+&nbsp;x²&nbsp;+&nbsp;1。试求&nbsp;CRC&nbsp;编码。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('9f64356966b543219cf1f672e0cc9dd0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497667"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由&nbsp;2ʳ&nbsp;≥&nbsp;k&nbsp;+&nbsp;r&nbsp;+&nbsp;1，可得：r&nbsp;≥&nbsp;4<BR>又由&nbsp;r&nbsp;&lt;&nbsp;g，可得&nbsp;r=4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<BR>（1）x⁴&nbsp;*&nbsp;K（x）的数码为&nbsp;11101110&nbsp;0000；<BR>（2）余数&nbsp;R（x）=&nbsp;x⁴&nbsp;*&nbsp;K（x）/G（x）&nbsp;为&nbsp;1110；<BR>（3）其码字多项式&nbsp;x⁴&nbsp;*&nbsp;K（x）&nbsp;+&nbsp;R（x）的&nbsp;CRC&nbsp;编码为&nbsp;11101110&nbsp;1110&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497668" id="question883497668" data="883497668">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">7. <span
											class="colorShallow">(简答题)</span>有一个点对点链路，长度为&nbsp;20000&nbsp;Km，数据的发送速率是&nbsp;1&nbsp;Mbit/s，要发送的数据有&nbsp;100&nbsp;字节，数据在此链路上的传播速度为&nbsp;2*10⁸&nbsp;m/s。求对应的传播时延和最小传输时延。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b07724facd9b41dfa77b4274a5d0a2db', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497668"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：传播时延为：L/V=20000*1000/（2*10⁸）=0.1&nbsp;s<BR>最小传输时延为：D/C=100*8/10⁶=0.0008&nbsp;s&nbsp;&nbsp;&nbsp;&nbsp;（2分/个）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497669" id="question883497669" data="883497669">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">8. <span
											class="colorShallow">(简答题)</span>某企业分配给产品部的&nbsp;IP&nbsp;地址块为&nbsp;192.168.31.192/26，分配给市场部的&nbsp;IP&nbsp;地址块为&nbsp;192.168.31.160/27，分配给财务部的&nbsp;IP&nbsp;地址块为&nbsp;192.168.31.128/27，求这&nbsp;3&nbsp;个地址块经过聚合后的地址块。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('675a63fc18104e21afb2c32b28caae83', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497669"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：如果要聚合&nbsp;1&nbsp;位地址的两个地址块，需要满足三个条件：<BR>（1）地址块大小相同；<BR>（2）要聚合的位一个为&nbsp;0，另一个为&nbsp;1；<BR>（3）聚合位的前面位必须全部相同。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1分）<BR>因此，先将“192.168.31.160/27”和“192.168.31.128/27”两个大小相同的地址块的第&nbsp;4&nbsp;段转换为二进制数：<BR>160＝（10100000）<BR>128＝（10000000）<BR>通过比较可知：满足以上三个条件，可以聚合为“192.168.31.128/26”；&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<BR>同理，再将聚合后的“192.168.31.128/26”与“192.168.31.192/26”进行比较聚合，可得：192.168.31.128/25。（1分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497670" id="question883497670" data="883497670">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">9. <span
											class="colorShallow">(简答题)</span>若一条信道的带宽为&nbsp;2&nbsp;K，其信号的电平级数为&nbsp;32&nbsp;级，信噪比为&nbsp;30&nbsp;分贝，在该信道上的最大传输率是多大？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('be813ca29f77464f933c3b5c151c3951', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497670"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由单位换算可知：30&nbsp;dB&nbsp;的信噪比相当于&nbsp;S/N=1000；（2分）<BR>由香农定理可知：Cmax=W*㏒₂（1+S/N）；<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=2000*&nbsp;㏒₂（1+1000）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;≈20&nbsp;Kb/s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497671" id="question883497671" data="883497671">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">10. <span
											class="colorShallow">(简答题)</span>在循环冗余编码中，信息位为&nbsp;1101，生成多项式为&nbsp;x³&nbsp;+&nbsp;x²&nbsp;+&nbsp;1，求其对应的&nbsp;CRC&nbsp;编码。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5aaaafc58b9d42f7aaa74c3303b07925', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497671"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由题意可知：k=4，g=4<BR>由&nbsp;2ʳ&nbsp;≥&nbsp;k+r+1，r&nbsp;≥&nbsp;3<BR>又由&nbsp;r&lt;g，r&lt;4，因此，r=3&nbsp;&nbsp;&nbsp;（2分）<BR>（1）K（x）=&nbsp;x³&nbsp;+&nbsp;x²&nbsp;+&nbsp;1，x³&nbsp;*&nbsp;K（x）=x⁶+x⁵+x³；<BR>（2）R（x）=&nbsp;x³&nbsp;*&nbsp;K（x）/G（x）=0；<BR>（3）码字多项式为：x³&nbsp;*&nbsp;K（x）&nbsp;+&nbsp;R（x）=x⁶+x⁵+x³；<BR>其编码为：1101000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497672" id="question883497672" data="883497672">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">11. <span
											class="colorShallow">(简答题)</span>某企业分配给人事部的&nbsp;IP&nbsp;地址块为10.0.11.0/27，分配给企划部的IP地址块为10.0.11.32/27，分配给市场部的IP地址块为10.0.11.64/26，求这三个地址块经过聚合后的地址块。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('2f81bb3fd8ab4cb3aa5efc8e27a68ee3', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497672"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：如果要聚合&nbsp;1&nbsp;位地址的两个地址块，需要满足三个条件：<BR>（1）地址块大小相同；<BR>（2）要聚合的位一个为&nbsp;0，另一个为&nbsp;1；<BR>（3）聚合位的前面位必须全部相同。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1分）<BR>将&nbsp;2&nbsp;个大小相同的地址块的第&nbsp;4&nbsp;段转换为二进制数：<BR>&nbsp;0=（00000000）<BR>32=（00100000）<BR>通过比较可知：满足以上三个条件，聚合为&nbsp;10.0.11.0/26；&nbsp;&nbsp;（2分）<BR>同理，再将聚合后的&nbsp;10.0.11.0/26&nbsp;与&nbsp;10.0.11.64/26&nbsp;进行聚合为&nbsp;10.0.11.0/25。&nbsp;&nbsp;（1分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497673" id="question883497673" data="883497673">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">12. <span
											class="colorShallow">(简答题)</span>有一个点对点链路，数据率为&nbsp;2Mb/s，长度为&nbsp;50&nbsp;Km，若数据在此链路上的传播速度为&nbsp;2*10⁸&nbsp;m/s，发送&nbsp;100&nbsp;字节的数据，求它的传播时延和最小传输时延。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d56f2d6d9d19439d85b11a29ce857374', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497673"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：传播时延&nbsp;=&nbsp;L/V&nbsp;=50*1000/（2*10⁸）=&nbsp;2.5*10⁻⁴&nbsp;s<BR>最小传输时延&nbsp;=&nbsp;D/C&nbsp;=&nbsp;100*8/（2*10⁶）=&nbsp;4*10⁻⁴&nbsp;s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分/个）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497674" id="question883497674" data="883497674">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">13. <span
											class="colorShallow">(简答题)</span>若一条信道的带宽为&nbsp;6&nbsp;K，其信号的电平级数为&nbsp;8&nbsp;级，信噪比为&nbsp;30&nbsp;分贝，在该信道上的最大传输率是多大？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('7bb9659fedde4972912a16194e1a2ba7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497674"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由单位换算可知：30&nbsp;dB&nbsp;的信噪比相当于&nbsp;S/N=1000&nbsp;&nbsp;（2分）<BR>由香农定理可知：Cmax=W*㏒₂（1+S/N）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=6000*㏒₂（1+1000）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;≈60&nbsp;Kb/s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497675" id="question883497675" data="883497675">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">14. <span
											class="colorShallow">(简答题)</span>要发送的数据为&nbsp;1011101110。采用&nbsp;CRC&nbsp;&nbsp;的生成多项式是&nbsp;P（x）=x⁴&nbsp;+&nbsp;x&nbsp;+&nbsp;1。试求&nbsp;CRC&nbsp;编码。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5a6d3b981b5341de975be74e0526edc2', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497675"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由&nbsp;2ʳ&nbsp;≥&nbsp;k&nbsp;+&nbsp;r&nbsp;+&nbsp;1，可得：r&nbsp;≥&nbsp;4<BR>又由&nbsp;r&nbsp;&lt;&nbsp;g，可得&nbsp;r=4（2分）<BR>（1）x⁴&nbsp;*&nbsp;K（x）的数码为&nbsp;1011101110&nbsp;0000；<BR>（2）余数&nbsp;R（x）=&nbsp;x⁴&nbsp;*&nbsp;K（x）/G（x）&nbsp;为&nbsp;1111；<BR>（3）其码字多项式&nbsp;x⁴&nbsp;*&nbsp;K（x）&nbsp;+&nbsp;R（x）的&nbsp;CRC&nbsp;编码为&nbsp;1011101110&nbsp;1111（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497676" id="question883497676" data="883497676">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">15. <span
											class="colorShallow">(简答题)</span>下表为某路由器的路由表。如果该路由器接收到源&nbsp;IP&nbsp;地址为&nbsp;10.2.56.79、目的&nbsp;IP&nbsp;地址为&nbsp;10.2.1.4&nbsp;的&nbsp;IP&nbsp;数据报，那么它会将该数据报投递到（&nbsp;&nbsp;）。<br>前缀匹配&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;下一跳<br>10.2.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<br>10.3.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<br>10.1.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.2.0.5<br>10.4.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.3.0.7
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bd9fe519a9b14681b0b869fb8eade9d4', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497676"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd><p>答：项目1：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.2.0.0，与目的网络&nbsp;10.2.0.0&nbsp;&nbsp;匹配<br/>项目2：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.2.0.0，与目的网络&nbsp;10.3.0.0&nbsp;&nbsp;不匹配<br/>项目3：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.2.0.0，与目的网络&nbsp;10.1.0.0&nbsp;&nbsp;不匹配<br/>项目4：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;10.2.0.0，与目的网络&nbsp;10.4.0.0&nbsp;&nbsp;不匹配（3分）<br/>通过四个项目的比较，只有第一个项目的网络与计算出的网络匹配，交给项目进行直接投递，即由路由器将报文直接投递到&nbsp;10.2.1.4。（1分）</p></dd>
                            </dl>
            </div>

            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>  </div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497677" id="question883497677" data="883497677">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">16. <span
											class="colorShallow">(简答题)</span>有一个点对点链路，长度为&nbsp;50000&nbsp;Km，数据的发送速率是&nbsp;1&nbsp;Gbit/s，要发送的数据有&nbsp;1000&nbsp;字节，数据在此链路上的传播速度为&nbsp;2*10⁸&nbsp;m/s。求对应的传播时延和最小传输时延。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bd7984adb27747c39db21fcc40b694f8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497677"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：传播时延为：L/V=50000*1000/（2*10⁸）=0.25&nbsp;s<BR>最小传输时延为：D/C=1000*8/10⁹=0.000008&nbsp;s&nbsp;&nbsp;&nbsp;&nbsp;（2分/个）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497678" id="question883497678" data="883497678">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">17. <span
											class="colorShallow">(简答题)</span>若一条信道的带宽为&nbsp;5&nbsp;K，其信号的电平级数为&nbsp;64&nbsp;级，信噪比为&nbsp;30&nbsp;分贝，在该信道上的最大传输率是多大？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('b3ee717dbf3c4573bb245249dd9aa468', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497678"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由单位换算可知：30&nbsp;dB&nbsp;的信噪比相当于&nbsp;S/N=1000；（2分）<BR>由香农定理可知：Cmax=W*㏒₂（1+S/N）；<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=5000*&nbsp;㏒₂（1+1000）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;≈50&nbsp;Kb/s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497679" id="question883497679" data="883497679">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">18. <span
											class="colorShallow">(简答题)</span>下表为一路由器的路由表。如果该路由器接收到目的地址为&nbsp;110.1.1.4&nbsp;的&nbsp;IP&nbsp;数据报，那么它采取的动作为（&nbsp;&nbsp;）。<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一路由器<BR>110.2.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>110.3.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;直接投递<BR>110.1.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.7.1.5<BR>110.4.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.6.2.7
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('d6cc53b1ea524e69ae3457762ed0100e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497679"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：项目1：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;110.1.0.0，与目的网络&nbsp;110.2.0.0&nbsp;&nbsp;不匹配<BR>项目2：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;110.1.0.0，与目的网络&nbsp;110.3.0.0&nbsp;&nbsp;不匹配<BR>项目3：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;110.1.0.0，与目的网络&nbsp;110.1.0.0&nbsp;&nbsp;匹配<BR>项目4：&nbsp;D.and.255.255.0.0&nbsp;得网络地址为&nbsp;110.1.0.0，与目的网络&nbsp;110.4.0.0&nbsp;&nbsp;不匹配（3分）<BR>通过四个项目的比较，只有第三个项目的网络与计算出的网络匹配，所以交给第三个项目进行投递，即将报文转发至&nbsp;10.7.1.5。（1分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497680" id="question883497680" data="883497680">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">19. <span
											class="colorShallow">(简答题)</span>要发送的数据为&nbsp;11011101。采用&nbsp;CRC&nbsp;的生成多项式是&nbsp;P（x）=x⁴&nbsp;+&nbsp;1。试求&nbsp;CRC&nbsp;编码。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('866cb295668e4de898dd1ed5f683e9d9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497680"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：由&nbsp;2ʳ&nbsp;≥&nbsp;k&nbsp;+&nbsp;r&nbsp;+&nbsp;1，可得：r&nbsp;≥&nbsp;4<BR>又由&nbsp;r&nbsp;&lt;&nbsp;g，可得&nbsp;r=4（2分）<BR>（1）x⁴&nbsp;*&nbsp;K（x）的数码为&nbsp;11011101&nbsp;0000；<BR>（2）余数&nbsp;R（x）=&nbsp;x⁴&nbsp;*&nbsp;K（x）/G（x）&nbsp;为&nbsp;0000；<BR>（3）其码字多项式&nbsp;x⁴&nbsp;*&nbsp;K（x）&nbsp;+&nbsp;R（x）的&nbsp;CRC&nbsp;编码为&nbsp;11011101&nbsp;0000（2分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497681" id="question883497681" data="883497681">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">20. <span
											class="colorShallow">(简答题)</span>有一个点对点链路，数据率为&nbsp;100Mb/s，长度为&nbsp;5000&nbsp;Km，若数据在此链路上的传播速度为&nbsp;2*10⁸&nbsp;m/s，发送&nbsp;1000&nbsp;字节的数据，求它的传播时延和最小传输时延。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('1dc4aef96b3d46c48fa81312d301ed6a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497681"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>答：传播时延&nbsp;=&nbsp;L/V&nbsp;=5000*1000/（2*10⁸）=&nbsp;2.5*10⁻²&nbsp;s<BR>最小传输时延&nbsp;=&nbsp;D/C&nbsp;=&nbsp;1000*8/（100*10⁶）=&nbsp;8*10⁻⁵&nbsp;s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分/个）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
											
						
						<h2 tabindex="0" role="option" class="type_tit">五. 应用题1（共5
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497682" id="question883497682" data="883497682">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(应用题1)</span>要发送的数据为&nbsp;11101110。采用&nbsp;CRC&nbsp;的生成多项式是&nbsp;P（x）=x⁴&nbsp;+&nbsp;x²&nbsp;+&nbsp;1。试求&nbsp;CRC&nbsp;编码。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('fd71ec82a1a64c579798828b25d2c6fc', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497682"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。（0.5分）<BR>解：由&nbsp;2ʳ&nbsp;≥&nbsp;k&nbsp;+&nbsp;r&nbsp;+&nbsp;1，可得：r&nbsp;≥&nbsp;4<BR>又由&nbsp;r&nbsp;&lt;&nbsp;g，可得&nbsp;r=4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<BR>（1）x⁴&nbsp;*&nbsp;K（x）的数码为&nbsp;11101110&nbsp;0000；<BR>（2）余数&nbsp;R（x）=&nbsp;x⁴&nbsp;*&nbsp;K（x）/G（x）&nbsp;为&nbsp;1110；<BR>（3）其码字多项式&nbsp;x⁴&nbsp;*&nbsp;K（x）&nbsp;+&nbsp;R（x）的&nbsp;CRC&nbsp;编码为&nbsp;111011101110；（2分）<BR>答：……。&nbsp;（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497683" id="question883497683" data="883497683">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(应用题1)</span>路由器&nbsp;R&nbsp;的路由表如下所示。当它收到一个目的地址是&nbsp;145.13.160.78&nbsp;的分组，此分组的是由谁来转发？<BR>匹配前缀&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口<BR>145.13.0.0/18&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m0<BR>145.13.64.0/18&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m1<BR>145.13.128.0/18&nbsp;&nbsp;&nbsp;&nbsp;m2<BR>145.13.192.0/18&nbsp;&nbsp;&nbsp;&nbsp;m3
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('61cbec0bb8d84a019345edac1541f35b', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497683"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）<BR>解：由路由转发原理可知：（1分）<BR>项目&nbsp;1&nbsp;&nbsp;D.and.255.255.192.0&nbsp;得网络地址为&nbsp;145.13.128.0，与目的网络&nbsp;145.13.0.0&nbsp;&nbsp;&nbsp;不匹配<BR>项目&nbsp;2&nbsp;&nbsp;D.and.255.255.192.0&nbsp;得网络地址为&nbsp;145.13.128.0，与目的网络&nbsp;145.13.64.0&nbsp;&nbsp;不匹配<BR>项目&nbsp;3&nbsp;&nbsp;D.and.255.255.192.0&nbsp;得网络地址为&nbsp;145.13.128.0，与目的网络&nbsp;145.13.128.0&nbsp;&nbsp;匹配<BR>项目&nbsp;4&nbsp;&nbsp;D.and.255.255.192.0&nbsp;得网络地址为&nbsp;145.13.128.0，与目的网络&nbsp;145.13.192.0&nbsp;不匹配<BR>通过比较可知：只有第三条路由满足，因此，由&nbsp;m2&nbsp;转发。&nbsp;（3分）<BR>答：……。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497684" id="question883497684" data="883497684">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(应用题1)</span>假定路由器&nbsp;R&nbsp;现在收到一个&nbsp;IP&nbsp;数据包，其目的&nbsp;IP&nbsp;地址是&nbsp;128.30.36.138，已知路由器&nbsp;R&nbsp;的路由表如下所示，请问该&nbsp;IP&nbsp;数据包会经由哪里进行转发，并说明理由。若路由器&nbsp;R&nbsp;又收到一个&nbsp;IP&nbsp;数据包，目的&nbsp;IP&nbsp;地址是&nbsp;128.36.36.36，又将作何处理？<BR>前缀匹配&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;下一跳<BR>128.30.33.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口&nbsp;0<BR>128.30.36.0/25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;接口&nbsp;1<BR>128.30.36.0/24&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R2
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('353f49ecfa2047649a7d67b592dbc1d1', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497684"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知……，求……&nbsp;（0.5分）<BR>解：根据&nbsp;CIDR&nbsp;路由转发原理：用目的&nbsp;IP&nbsp;地址与路由器路由表中每个项目的子网掩码作逻辑与，将得到的网络号与本路由项目的目的网络进行对比，找出所有的匹配项目，在其中找出最长的项目，交由它去转发，否则，交由默认路由去处理，如果没有默认路由，就丢弃。（1分）<BR>（1）目的&nbsp;IP&nbsp;地址为&nbsp;128.30.36.138<BR>用目的&nbsp;IP&nbsp;地址与每个项目的子网掩码进行逻辑与可得：<BR>第一条的网络号为&nbsp;128.30.33.128，与本项目的网络号&nbsp;128.30.33.0&nbsp;不匹配；<BR>第二条的网络号为&nbsp;128.30.36.128，与本项目的网络号&nbsp;128.30.36.0&nbsp;不匹配；<BR>第三条的网络号为&nbsp;128.30.36.0，与本项目的网络号&nbsp;128.30.36.0&nbsp;匹配；<BR>且只有第&nbsp;3&nbsp;条项目符合要求，因此，由&nbsp;R2&nbsp;转发。&nbsp;&nbsp;（2分）<BR>（2）同理可得：目的&nbsp;IP&nbsp;地址为&nbsp;128.36.36.36&nbsp;与路由表中每个项目的子网掩码相与，都不匹配，且路由表中没有默认路由，因此，分组被丢弃。&nbsp;（1分）<BR>答：……&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497685" id="question883497685" data="883497685">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(应用题1)</span>某公司分配给人事部、培训部和销售部的&nbsp;IP&nbsp;地址块分别为&nbsp;121.52.33.224/27、121.52.33.208/28&nbsp;和&nbsp;121.52.33.192/28，求&nbsp;3&nbsp;个地址块聚合后的地址块。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('84279cb0d911423ea516aa98e7559c0a', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497685"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。（0.5分）<BR>解：要聚合的两个地址块，需要满足三个条件：<BR>（1）大小相同；<BR>（2）聚合位相异：一个为&nbsp;0，另一个为&nbsp;1；<BR>（3）聚合位之前全部相同。（1分）<BR>将&nbsp;2&nbsp;个大小相同的地址块的第&nbsp;4&nbsp;段转换为二进制数：<BR>208=（11010000）<BR>192=（11000000）<BR>通过比较可知：满足以上三个条件，聚合为&nbsp;121.52.33.192/27；（2分）<BR>同理，再将聚合后的&nbsp;121.52.33.192/27&nbsp;与&nbsp;121.52.33.224/27&nbsp;进行聚合为&nbsp;121.52.33.192/26。（1分）<BR>答：……。（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497686" id="question883497686" data="883497686">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(应用题1)</span>IP&nbsp;地址块&nbsp;59.81.1.128/28、59.81.1.144/28&nbsp;和&nbsp;59.81.1.160/28&nbsp;经过聚合后可用的地址数为多少？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('82eb29702f734023bfcab17b1de83f80', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497686"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。（0.5分）<BR>解：要聚合的两个地址块，需要满足三个条件：<BR>（1）大小相同；<BR>（2）聚合位相异：一个为&nbsp;0，另一个为&nbsp;1；<BR>（3）聚合位之前全部相同。（1分）<BR>将三个大小相同的地址块的第&nbsp;4&nbsp;段转换为二进制数：<BR>128＝（10000000）<BR>144＝（10010000）<BR>160＝（10100000）<BR>通过比较可知：满足以上三个条件，只有“59.81.1.128/28”和“59.81.1.144/28”可以聚合为“59.81.1.128/27”，而“59.81.1.160/28”无法聚合。（2分）<BR>因此，59.81.1.128/27&nbsp;的主机位占&nbsp;32-27＝5&nbsp;位，可用的地址数为&nbsp;2⁵&nbsp;-2=30；<BR>59.81.1.160/28&nbsp;的主机占&nbsp;32-28=4&nbsp;位，可用的地址数为&nbsp;2⁴&nbsp;-2=14；<BR>若三个地址聚合后可用的地址数为&nbsp;30+14=44。（1分）<BR>答：……。（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
											
						
						<h2 tabindex="0" role="option" class="type_tit">六. 应用题2（共10
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497687" id="question883497687" data="883497687">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(应用题2)</span>已知：IP&nbsp;地址&nbsp;111.181.21.9&nbsp;子网掩码&nbsp;255.192.0.0，求：<BR>（1）地址类别&nbsp;<BR>（2）网络地址&nbsp;<BR>（3）直接广播地址&nbsp;<BR>（4）主机号&nbsp;<BR>（5）网内的最后一个可用&nbsp;IP&nbsp;地址
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('f5623eeb69b646c4a1e0c6f1038ab610', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497687"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：......，求......&nbsp;(0.5分)<BR>解：（1）由&nbsp;IP&nbsp;地址&nbsp;111.181.21.9&nbsp;的第一字节值为&nbsp;111，其地址为&nbsp;A&nbsp;类地址。<BR>（2）由于子网掩码为&nbsp;255.192.0.0，把它与&nbsp;IP&nbsp;地址&nbsp;111.181.21.9&nbsp;进行相与得网络地址为&nbsp;111.128.0.0；<BR>（3）直接广播地址是针对对应的网络号&nbsp;111.128.0.0&nbsp;其主机号全为&nbsp;1&nbsp;的地址，计算得&nbsp;&nbsp;111.191.255.255；<BR>（4）主机号是&nbsp;IP&nbsp;地址减去网络地址，计算得&nbsp;0.53.21.9；<BR>（5）网内的最后一个可用的&nbsp;IP&nbsp;地址是直接广播地址&nbsp;191.23.191.255&nbsp;的前一个地址，即为&nbsp;111.191.255.254。&nbsp;&nbsp;（1分/个）<BR>答：........&nbsp;(0.5分)</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497688" id="question883497688" data="883497688">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(应用题2)</span>一个&nbsp;UDP&nbsp;用户数据的数据字段为&nbsp;8192&nbsp;字节，在数据链路层要使用以太网来传送，若&nbsp;IP&nbsp;报文只有固定首部，试问应当划分为几个&nbsp;IP&nbsp;数据报片？说明每一个&nbsp;IP&nbsp;数据报字段长度和片偏移字段的值。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('bec63f1953a24a2aae893a673de44c5e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497688"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.5分)<BR>解：由&nbsp;UDP&nbsp;用户数据报结构可知：要传输&nbsp;UDP&nbsp;数据字段为&nbsp;8192&nbsp;个字节的数据，其&nbsp;UDP&nbsp;数据报总长度应为：8192+8=8200&nbsp;字节；<BR>又因为数据帧能携带的最大数据长度为&nbsp;1500&nbsp;个字节，所以数据帧能承接网络层的最大&nbsp;IP&nbsp;报文片为&nbsp;1500&nbsp;个字节<BR>若&nbsp;IP&nbsp;报文只有固定首部，IP&nbsp;报文片能承接的&nbsp;UDP&nbsp;最大的数据量为&nbsp;1500-20=1480&nbsp;个字节；<BR>8200&nbsp;个字节的&nbsp;UDP&nbsp;报文在数据链路层使用以太网传输，应当划分为&nbsp;6&nbsp;个报片，其每个&nbsp;IP&nbsp;数据字段长度和片偏移值如下表：&nbsp;&nbsp;&nbsp;(2分)<BR>数据报片序号&nbsp;&nbsp;&nbsp;片偏移值&nbsp;&nbsp;&nbsp;数据字段长度<BR>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480<BR>2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;185&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480<BR>3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;370&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480<BR>4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;555&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480<BR>5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;740&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1480<BR>6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;925&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;800&nbsp;&nbsp;&nbsp;(3分)<BR>答：……&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.5分)</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497689" id="question883497689" data="883497689">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(应用题2)</span>假定网络中的路由器&nbsp;A&nbsp;的路由表有如下的项目（这三列分别表示“目的网络”、“距离”和“下一跳路由器”）<BR>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>N6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F<BR>N8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E<BR>N9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F<BR>现在&nbsp;A&nbsp;收到从&nbsp;B&nbsp;发来的路由信息（这两列分别表示“目的网络”“距离”）：<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4<BR>N4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2<BR>N5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5<BR>N8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3<BR>N9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2<BR>试求出路由器&nbsp;A&nbsp;更新后的路由表（详细说明每一个步骤）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('5743503237724aa1b5612902110695c9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497689"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。（0.5分）<BR>解：由&nbsp;RIP&nbsp;报文算法原理可知：（1分）<BR>（1）&nbsp;先将收到&nbsp;B&nbsp;的通告报文项目改为：<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;<BR>N4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>N5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>N8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>N9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1分）<BR>（2）&nbsp;与路由器&nbsp;A&nbsp;的路由进行比较更新，更新后的路由表如下：<BR>N1&nbsp;&nbsp;4&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;无新信息，不改变<BR>N2&nbsp;&nbsp;5&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;相同的下一跳，更新<BR>N4&nbsp;&nbsp;3&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;新的项目，添加项目<BR>N5&nbsp;&nbsp;6&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;新的项目，添加项目<BR>N6&nbsp;&nbsp;8&nbsp;&nbsp;F&nbsp;&nbsp;&nbsp;无新信息，不改变<BR>N8&nbsp;&nbsp;3&nbsp;&nbsp;E&nbsp;&nbsp;&nbsp;不同的下一跳，距离更大，不更新<BR>N9&nbsp;&nbsp;3&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;不同的下一跳，距离更小，更新&nbsp;&nbsp;&nbsp;&nbsp;（3分）<BR>答：……。（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497690" id="question883497690" data="883497690">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(应用题2)</span>计算并填写下表。<BR>IP&nbsp;地址&nbsp;193.23.201.17<BR>子网掩码&nbsp;255.255.192.0<BR>地址类别（&nbsp;&nbsp;）<BR>网络地址（&nbsp;&nbsp;）<BR>直接广播地址（&nbsp;&nbsp;）<BR>主机号（&nbsp;&nbsp;）<BR>网内的第一个可用&nbsp;IP&nbsp;地址（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c7051db0c0194bd9a5872671f534b9cb', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497690"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求：……&nbsp;&nbsp;(0.5分)<BR>解：（1）由&nbsp;IP&nbsp;地址&nbsp;193.23.201.17&nbsp;的第一字节值&nbsp;193&nbsp;大于&nbsp;191，而小于&nbsp;224&nbsp;可知，地址的类别为&nbsp;C&nbsp;类地址；<BR>（2）由于子网掩码为&nbsp;255.255.192.0，把它与&nbsp;IP&nbsp;地址&nbsp;193.23.201.17&nbsp;进行相与得网络地址为&nbsp;193.23.192.0；<BR>（3）直接广播地址是针对对应的网络号&nbsp;193.23.192.0&nbsp;其主机号全为&nbsp;1&nbsp;的地址，计算得&nbsp;&nbsp;193.23.255.255；<BR>（4）主机号是&nbsp;IP&nbsp;地址减去网络地址，计算得&nbsp;0.0.9.17；<BR>（5）网内的第一个可用的&nbsp;IP&nbsp;地址是网络地址&nbsp;193.23.192.0&nbsp;后的第一个地址，即为&nbsp;193.23.192.1。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1分/个)<BR>答：……&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.5分)</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497691" id="question883497691" data="883497691">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(应用题2)</span>在某个网络中，A&nbsp;和&nbsp;B&nbsp;为相邻路由器，其中表&nbsp;a&nbsp;为&nbsp;A&nbsp;的原路由表，表&nbsp;b&nbsp;为&nbsp;B&nbsp;广播的距离向量报文&nbsp;&lt;目的网络，距离&gt;，请根据&nbsp;RIP&nbsp;协议更新&nbsp;A&nbsp;的路由表，并写出更新后的&nbsp;A&nbsp;路由表。<BR>A&nbsp;路由表&nbsp;a：<BR>目的网络&nbsp;&nbsp;&nbsp;&nbsp;距离&nbsp;&nbsp;&nbsp;下一跳<BR>20.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<BR>35.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R7<BR>40.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>45.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R8<BR>180.0.0.0&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D<BR>190.0.0.0&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R5<BR>B&nbsp;路由表&nbsp;b：<BR>目的网络&nbsp;&nbsp;&nbsp;&nbsp;距离<BR>20.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;3<BR>35.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;5<BR>40.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;4<BR>42.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;3<BR>180.0.0.0&nbsp;&nbsp;&nbsp;5
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('4c71b7a1e32845daa214562cac89703d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497691"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.5分)<BR>解：由&nbsp;RIP&nbsp;报文算法原理可知：&nbsp;&nbsp;(1分)<BR>（1）&nbsp;先将收到&nbsp;B&nbsp;的通告报文项目改为：<BR>目的网络&nbsp;&nbsp;&nbsp;距离&nbsp;&nbsp;&nbsp;下一跳<BR>20.0.0.0&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;<BR>35.0.0.0&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;<BR>40.0.0.0&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>42.0.0.0&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>180.0.0.0&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1分)<BR>（2）&nbsp;与路由器&nbsp;A&nbsp;的路由进行比较更新，更新后的路由表如下：<BR>20.0.0.0&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;不同的下一跳，距离更长，不更新<BR>35.0.0.0&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;不同的下一跳，距离更小，更新<BR>40.0.0.0&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;相同的下一跳，更新<BR>42.0.0.0&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;新路由，直接添加<BR>45.0.0.0&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;无新信息，不改变<BR>180.0.0.0&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;不同的下一跳，距离更长，不更新<BR>190.0.0.0&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;无新信息，不改变&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3分)<BR>答：……。&nbsp;&nbsp;(0.5分)</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497692" id="question883497692" data="883497692">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">6. <span
											class="colorShallow">(应用题2)</span>计算并填写下表。<BR>IP&nbsp;地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>子网掩码（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>地址类别（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>网络地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>直接广播地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>主机号&nbsp;0.0.17.23&nbsp;&nbsp;<BR>网内的最后一个可用&nbsp;IP&nbsp;地址&nbsp;152.59.223.254
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('19fb908d17ff45079a388b49288ee561', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497692"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……&nbsp;&nbsp;（0.5分）<BR>解：（1）由于&nbsp;IP&nbsp;地址的第一字节为&nbsp;152，可知地址类别为&nbsp;B&nbsp;类；<BR>（2）将网内最后一个可用&nbsp;IP&nbsp;地址&nbsp;152.59.223.254&nbsp;的主机号加&nbsp;1&nbsp;可得直接广播地址，因此，直接广播地址为&nbsp;152.59.223.255；<BR>（3）由主机号为&nbsp;0.0.17.23&nbsp;可知：主机位从第三段开始，把主机号的第三段&nbsp;17&nbsp;和直接广播地址第三段&nbsp;223&nbsp;都转换为二进制数：<BR>&nbsp;17&nbsp;&nbsp;&nbsp;&nbsp;00010001&nbsp;&nbsp;说明主机位至少有&nbsp;5&nbsp;位<BR>223&nbsp;&nbsp;&nbsp;&nbsp;11011111&nbsp;&nbsp;说明主机位最多有&nbsp;5&nbsp;位<BR>进行比较可知：本段后&nbsp;5&nbsp;位为主机位，前&nbsp;3&nbsp;位为网络位，因此，网络地址为&nbsp;152.59.192.0；<BR>（4）由于网络号为&nbsp;19&nbsp;位，可知子网掩码为&nbsp;255.255.224.0；<BR>（5）将网络地址加上主机地址得&nbsp;IP&nbsp;地址，因此，IP&nbsp;为&nbsp;152.59.209.23。&nbsp;&nbsp;（1分/个）<BR>答：……&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497693" id="question883497693" data="883497693">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">7. <span
											class="colorShallow">(应用题2)</span>计算并填写下表<BR>IP&nbsp;地址&nbsp;121.23.181.13<BR>主机地址&nbsp;0.0.21.13<BR>地址类别（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>网络地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>子网掩码（&nbsp;&nbsp;）<BR>直接广播地址（&nbsp;&nbsp;）&nbsp;<BR>网内的最后一个可用&nbsp;IP&nbsp;地址（&nbsp;&nbsp;）
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0727872c92b74761a39c1a450723dae0', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497693"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：……，求……。（0.5分）<BR>解：（1）由&nbsp;IP&nbsp;地址&nbsp;121.23.181.13&nbsp;的第一字节值&nbsp;121&nbsp;小于&nbsp;127&nbsp;可知，地址的类别为&nbsp;A&nbsp;类地址；<BR>（2）IP&nbsp;地址是由网络地址&nbsp;+&nbsp;主机地址构成，因此，网络地址&nbsp;=&nbsp;IP&nbsp;地址&nbsp;-&nbsp;主机地址，可得：网络地址为&nbsp;121.23.160.0；<BR>（3）将网络地址的第三段&nbsp;160&nbsp;转换为二进制数为&nbsp;10100000，可知：网络号在本段中至少占&nbsp;3&nbsp;位；<BR>又将主机地址的第三段&nbsp;21&nbsp;转换为二进制数为&nbsp;00010101，可知：主机号在本段中至少占&nbsp;5&nbsp;位；<BR>由此可以确定，本段中网络号占&nbsp;3&nbsp;位，主机号占&nbsp;5&nbsp;位，可得：本段掩码为&nbsp;11100000，其十进制数为&nbsp;224；<BR>该子网掩码为&nbsp;255.255.224.0；<BR>（4）直接广播地址是针对对应的网络号&nbsp;121.23.160.0&nbsp;其主机号全为&nbsp;1&nbsp;的地址，可得&nbsp;121.23.191.255；<BR>（5）网内的最后一个可用的&nbsp;IP&nbsp;地址是直接广播地址&nbsp;121.23.191.255&nbsp;的前一个地址，即为&nbsp;121.23.191.254。（1分/个）<BR>答：……（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497694" id="question883497694" data="883497694">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">8. <span
											class="colorShallow">(应用题2)</span>假定网络中的路由器&nbsp;A&nbsp;的路由表有如下的项目（这三列分别表示“目的网络”、“距离”和“下一跳路由器”）<BR>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<BR>N3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-<BR>N4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;G<BR>现在&nbsp;A&nbsp;收到从&nbsp;C&nbsp;发来的路由信息（这两列分别表示“目的网络”和“距离”）：<BR>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1<BR>N3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3<BR>试求出路由器&nbsp;A&nbsp;更新后的路由表（请说明理由）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('c3abcc09c3bd4522b84a12abcc601c63', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497694"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：当&nbsp;A&nbsp;收到&nbsp;C&nbsp;的路由信息后，求&nbsp;A&nbsp;的更新过程及路由表。（0.5分）<BR>解：由&nbsp;RIP&nbsp;报文算法原理可知：&nbsp;（2分）<BR>（1）&nbsp;先将收到&nbsp;C&nbsp;的通告报文项目改为：<BR>目的网络&nbsp;&nbsp;&nbsp;距离&nbsp;&nbsp;&nbsp;下一跳<BR>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;<BR>N3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1分）<BR>（2）&nbsp;与路由器&nbsp;A&nbsp;的路由进行比较更新，更新后的路由表如下：<BR>&nbsp;N1&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;不同的下一跳，距离更短，更新<BR>&nbsp;N2&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;相同的下一跳，更新<BR>&nbsp;N3&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;&nbsp;&nbsp;&nbsp;不同的下一跳，距离更长，不改变<BR>&nbsp;N4&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;G&nbsp;&nbsp;&nbsp;&nbsp;无新信息，不改变&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<BR>答：路由器&nbsp;A&nbsp;更新后的路由表如下：<BR>&nbsp;N1&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;C<BR>&nbsp;N2&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;C<BR>&nbsp;N3&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;-<BR>&nbsp;N4&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;G&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497695" id="question883497695" data="883497695">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">9. <span
											class="colorShallow">(应用题2)</span>假定网络中的路由器&nbsp;B&nbsp;的路由表有如下的项目（这三列分别表示“目的网络”、“距离”和“下一跳路由器”）<BR>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B<BR>N6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F<BR>N8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E<BR>N9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F<BR>现在&nbsp;B&nbsp;收到从&nbsp;C&nbsp;发来的路由信息（这两列分别表示“目的网络”“距离”）：<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4<BR>N3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8<BR>N6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4<BR>N8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3<BR>N9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5<BR>试求出路由器&nbsp;B&nbsp;更新后的路由表（详细说明每一个步骤）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('0128d98cc8c3409ea9cde0d65ff5180d', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497695"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：当&nbsp;B&nbsp;收到&nbsp;C&nbsp;的路由信息后，求&nbsp;B&nbsp;的更新过程及路由表。&nbsp;（0.5分）<BR>解：由&nbsp;RIP&nbsp;报文算法原理可知：&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<BR>（1）&nbsp;先将收到&nbsp;C&nbsp;的通告报文项目改为：<BR>目的网络&nbsp;&nbsp;&nbsp;距离&nbsp;&nbsp;&nbsp;下一跳<BR>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;<BR>N3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;<BR>N6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<BR>N8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<BR>N9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1分）<BR>（2）&nbsp;与路由器&nbsp;B&nbsp;的路由进行比较更新，更新后的路由表如下：<BR>N1&nbsp;&nbsp;7&nbsp;&nbsp;A&nbsp;&nbsp;&nbsp;无新信息，不改变<BR>N2&nbsp;&nbsp;5&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;相同的下一跳，更新<BR>N3&nbsp;&nbsp;9&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;新的项目，添加进来<BR>N6&nbsp;&nbsp;5&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;不同的下一跳，距离更短，更新<BR>N8&nbsp;&nbsp;4&nbsp;&nbsp;E&nbsp;&nbsp;&nbsp;不同的下一跳，距离一样，不改变<BR>N9&nbsp;&nbsp;4&nbsp;&nbsp;F&nbsp;&nbsp;&nbsp;不同的下一跳，距离更大，不改变&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<BR>答：路由器&nbsp;B&nbsp;更新后的路由表如下所示：<BR>N1&nbsp;&nbsp;7&nbsp;&nbsp;A<BR>N2&nbsp;&nbsp;5&nbsp;&nbsp;C<BR>N3&nbsp;&nbsp;9&nbsp;&nbsp;C<BR>N6&nbsp;&nbsp;5&nbsp;&nbsp;C<BR>N8&nbsp;&nbsp;4&nbsp;&nbsp;E<BR>N9&nbsp;&nbsp;4&nbsp;&nbsp;F&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497696" id="question883497696" data="883497696">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">10. <span
											class="colorShallow">(应用题2)</span>计算并填写下表。<BR>IP&nbsp;地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>子网掩码（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>地址类别（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>网络地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>直接广播地址（&nbsp;&nbsp;）&nbsp;&nbsp;<BR>主机号&nbsp;0.23.13.17&nbsp;&nbsp;<BR>网内的最后一个可用&nbsp;IP&nbsp;地址&nbsp;62.159.255.254
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('78c8bcd7ee044e2f9677a1c9c07ee8e6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer">
    <div class="mark_answer_key pad0">
        <dl class="mark_fill colorDeep">
            <dt class="positionStyle" tabindex="0" role="option"  ><i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                                    </div>
            </dt>
            <dd tabindex="0" role="option"  id="qbstuAnswer883497696"></dd>
        </dl>
                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>已知：主机号为&nbsp;0.23.13.17，网内最后一个可用的&nbsp;IP&nbsp;地址为&nbsp;62.159.255.254，求&nbsp;IP&nbsp;地址，子网掩码，地址的类别，网络地址和直接广播地址。（0.5分）<BR>解：（1）将网内最后一个可用&nbsp;IP&nbsp;地址&nbsp;62.159.255.254&nbsp;的主机号加&nbsp;1&nbsp;可得直接广播地址，因此，直接广播地址为&nbsp;62.159.255.255；<BR>（2）由主机号为&nbsp;0.23.13.17&nbsp;可知：第&nbsp;1&nbsp;字节为网络号；<BR>由直接广播地址为&nbsp;62.159.255.255，可知：第&nbsp;3、4&nbsp;字节全为&nbsp;1，一定是主机号；<BR>只需判断第&nbsp;2&nbsp;字节中网络号占多少位。<BR>将主机号和广播地址的第&nbsp;2&nbsp;字节转换为二进制数进行比较：<BR>&nbsp;23&nbsp;&nbsp;00010111&nbsp;&nbsp;说明主机位至少有&nbsp;5&nbsp;位<BR>159&nbsp;&nbsp;10011111&nbsp;&nbsp;说明主机位最多有&nbsp;5&nbsp;位<BR>通过对比可知，第&nbsp;2&nbsp;字节的前&nbsp;3&nbsp;位为网络号，其网络地址为&nbsp;62.128.0.0；<BR>（3）由于网络号为&nbsp;8+3=11&nbsp;位，可知子网掩码为&nbsp;255.224.0.0；<BR>（4）将网络地址加上主机地址得&nbsp;IP&nbsp;地址，因此，该主机的&nbsp;IP&nbsp;为&nbsp;62.151.13.17；<BR>（5）由于&nbsp;IP&nbsp;地址的第一字节的数字为&nbsp;62&nbsp;小于&nbsp;128，可知地址类别为&nbsp;A&nbsp;类。（1分/个）<BR>答：……（0.5分）</dd>
                            </dl>
            </div>

        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
											
						
						<h2 tabindex="0" role="option" class="type_tit">七. 原理题（共5
							题）</h2>
						    					    
																					<div class="marBom60 questionLi scroll_883497697" id="question883497697" data="883497697">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">1. <span
											class="colorShallow">(原理题)</span>假定网络中的路由器&nbsp;B&nbsp;的路由表有如下的项目（这三列分别表示“目的网络”、“距离”和“下一跳路由器”）<br>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A<br>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<br>N3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-<br>N4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;G<br>现在&nbsp;B&nbsp;收到从&nbsp;C&nbsp;发来的路由信息（这两列分别表示“目的网络”和“距离”）：<br>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3<br>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1<br>N5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3<br>试求出路由器&nbsp;B&nbsp;更新后的路由表（请说明理由）。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('21ae1f40a6cd440593dfd8b442c58cb8', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497697">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 已知：当&nbsp;B&nbsp;收到&nbsp;C&nbsp;的路由信息后，求&nbsp;B&nbsp;的更新过程及路由表。（0.5分）<br>解：由&nbsp;RIP&nbsp;报文算法原理可知：&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（2分）<br>(1)&nbsp;先将收到C的通告报文项目改为：<br>目的网络&nbsp;&nbsp;&nbsp;距离&nbsp;&nbsp;&nbsp;下一跳<br>N1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;<br>N2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;<br>N5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1分）<br>(2)&nbsp;与路由器B的路由进行比较更新，更新后的路由表如下：<br>&nbsp;N1&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;A&nbsp;&nbsp;&nbsp;&nbsp;不同的下一跳，距离更长，不改变<br>&nbsp;N2&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;相同的下一跳，更新<br>&nbsp;N3&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;&nbsp;&nbsp;&nbsp;无新信息，不改变<br>&nbsp;N4&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;G&nbsp;&nbsp;&nbsp;&nbsp;无新信息，不改变<br>&nbsp;N5&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;新路由，增加&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（3分）<br>答：路由器B更新后的路由表如下：<br>&nbsp;N1&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;A<br>&nbsp;N2&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;C<br>&nbsp;N3&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;-<br>&nbsp;N4&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;G<br>&nbsp;N5&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>
            <div class="analysisDiv" tabindex="0" role="option" >
            <div class="analysis"><i>答案解析：</i>  </div>
        </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497698" id="question883497698" data="883497698">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">2. <span
											class="colorShallow">(原理题)</span>主机&nbsp;A&nbsp;向主机&nbsp;B&nbsp;连续发送了三个&nbsp;TCP&nbsp;报文段，其序号分别为&nbsp;0、30&nbsp;和&nbsp;50。试问：<BR>（1）第一个报文段携带了多少个字节的数据？<BR>（2）主机&nbsp;B&nbsp;收到第一个报文段后发回的确认中的确认号应当是多少？<BR>（3）如果主机&nbsp;B&nbsp;收到第三个报文段后发回的确认中的确认号是&nbsp;90，试问&nbsp;A&nbsp;发送的第三个报文段中的数据有多少字节？<BR>（4）如果&nbsp;A&nbsp;发送的第二个报文段丢失了，但第三个报文段到达了&nbsp;B。B&nbsp;在第三个报文段到达后向&nbsp;A&nbsp;发送确认。试问这个确认号应为多少？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('074d6406a42c4207b6e88e0d0b6071b6', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497698">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 已知：……，求：……（0.5分）
<br>解：（1）由题意可知：第一个报文段的数据序号是&nbsp;0～29，因此，L1=30&nbsp;B。
<br>（2）当&nbsp;B&nbsp;收到第一个报文段后，确认&nbsp;29&nbsp;号字节数据已正确接收，期望下一个数据&nbsp;30&nbsp;号字节的到来，因此，确认号&nbsp;ack1=30。
<br>（3）当收到第三个报文段后发回的确认号为&nbsp;ack3=90&nbsp;时，说明已正确接收了&nbsp;89&nbsp;号字节的数据，因此，第三个报文段数据序号是&nbsp;50～89，因此，L2=40&nbsp;B。
<br>（4）如果第二个报文段丢失，当第三个报文段收到后发回的确认号应该是对第一个报文段已正确接收作重复确认，期望第二个报文段数据的到来，因此，序号为第二个报文段的首字节序号&nbsp;ack1=30。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（1.5分/个）
<br>答：……&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497699" id="question883497699" data="883497699">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">3. <span
											class="colorShallow">(原理题)</span>已知主机&nbsp;A&nbsp;要向主机&nbsp;B&nbsp;发送&nbsp;3000&nbsp;B&nbsp;的数据。在&nbsp;TCP&nbsp;连接建立后，A&nbsp;的发送窗口大小是&nbsp;1000&nbsp;B，A&nbsp;的初始序号是&nbsp;0。<BR>（1）一开始&nbsp;A&nbsp;发送&nbsp;300&nbsp;B&nbsp;的数据。<BR>（2）接着&nbsp;A&nbsp;就一直发送数据，直到把发送窗口用完。<BR>（3）发送方&nbsp;A&nbsp;收到&nbsp;ack&nbsp;=&nbsp;500&nbsp;的确认报文段。<BR>（4）发送方&nbsp;A&nbsp;再发送&nbsp;350&nbsp;B&nbsp;的数据。<BR>请确定上面每种情况下，发送窗口中数据的最小序号和最大序号。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('300a2863d9114fc9936c0cb0b764825e', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497699">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 已知：……，求：……（0.5分）
<br>解：发送窗口是用来暂时保存已经发送但还没有收到确认的数据。发送窗口为&nbsp;1000&nbsp;B，数据发送前，整个窗口均为可用窗口，其序号为&nbsp;0~999。（2分）
<br>（1）A&nbsp;开始发送&nbsp;300&nbsp;B&nbsp;数据，就用了&nbsp;300&nbsp;字节，其发送窗口中数据的序号为&nbsp;0~299，而&nbsp;300~999&nbsp;为可用窗口。
<br>（2）发送方&nbsp;A&nbsp;一直发送数据，直到把发送窗口用完，即发送窗口中数据的序号为&nbsp;0~999。
<br>（3）发送方&nbsp;A&nbsp;收到&nbsp;ack=500&nbsp;的确认报文段，说明&nbsp;500&nbsp;号字节以前的数据出窗口，此时，发送窗口中的数据序号为&nbsp;500~999，而&nbsp;1000~1499&nbsp;为可用窗口。
<br>（4）发送方&nbsp;A&nbsp;再发送&nbsp;350&nbsp;字节，发送窗口中的最后字节编号为&nbsp;999+350=1349，此时，发送窗口中的数据序号为&nbsp;500~1349，而&nbsp;1350~1499&nbsp;可用窗口。（1分/个）
<br>答：……&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;（0.5分）</dd>
                            </dl>
            </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497700" id="question883497700" data="883497700">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">4. <span
											class="colorShallow">(原理题)</span>已知主机&nbsp;A&nbsp;要向主机&nbsp;B&nbsp;发送&nbsp;3&nbsp;KB&nbsp;的数据。在&nbsp;TCP&nbsp;连接建立后，A&nbsp;的发送窗口大小是&nbsp;2&nbsp;KB，A&nbsp;的初始序号是&nbsp;0。<BR>（1）一开始&nbsp;A&nbsp;发送&nbsp;1&nbsp;KB&nbsp;的数据。<BR>（2）接着&nbsp;A&nbsp;就一直发送数据，直到把发送窗口用完。<BR>（3）发送方&nbsp;A&nbsp;收到对第&nbsp;1000&nbsp;号字节的确认报文段。<BR>（4）发送方&nbsp;A&nbsp;再发送&nbsp;850&nbsp;B&nbsp;的数据。<BR>（5）发送方&nbsp;A&nbsp;收到&nbsp;ack&nbsp;=&nbsp;900&nbsp;的确认报文段。<BR>请确定上面每种情况下，发送窗口中数据的最小序号和最大序号。
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('423b4bdc88724a8da217d699d42c27d7', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497700">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 已知：……，求：……（0.5分）
<br>解：发送窗口是用来暂时保存已经发送但还没有收到确认的数据。发送窗口为&nbsp;2&nbsp;KB，即&nbsp;0~2047&nbsp;为可用窗口。（1分）
<br>（1）A&nbsp;开始发送&nbsp;1&nbsp;KB&nbsp;数据，就用了&nbsp;1024&nbsp;字节，其窗口中数据的序号为&nbsp;0~1023，而&nbsp;1024~2047&nbsp;为可用窗口。
<br>（2）发送方&nbsp;A&nbsp;一直发送数据，直到把发送窗口用完，即窗口中数据的序号为&nbsp;0~2047。
<br>（3）发送方&nbsp;A&nbsp;收到对第&nbsp;1000&nbsp;号字节的确认报文段，第&nbsp;1000&nbsp;号字节的数据出窗口，此时，发送窗口中的数据序号为&nbsp;1001~2047，而&nbsp;2048~3048&nbsp;为可用窗口。
<br>（4）发送方&nbsp;A&nbsp;再发送&nbsp;850&nbsp;字节，窗口中的最后字节编号为&nbsp;2047+850=2897，此时，发送窗口中的数据序号为&nbsp;1001~2897，而&nbsp;2898~3048&nbsp;可用窗口。
<br>（5）发送方&nbsp;A&nbsp;收到&nbsp;ack=900&nbsp;的确认报文段，说明这是迟到的确认，窗口状态不变，此时，发送窗口中的数据序号为&nbsp;1001~2897，而&nbsp;2898~3048&nbsp;可用窗口。（1分/个）
<br>答：……（0.5分）</dd>
                            </dl>
            </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
						    					    
																					<div class="marBom60 questionLi scroll_883497701" id="question883497701" data="883497701">
																<div class="Sub_tit_box">
									<h3 class="mark_name colorDeep">5. <span
											class="colorShallow">(原理题)</span>一个带宽为&nbsp;50&nbsp;Kbps&nbsp;的卫星信道，它的往返传播延时为&nbsp;500&nbsp;ms，网络使用&nbsp;1000&nbsp;bit&nbsp;长度的帧和停止-等待协议，请回答如下问题：<BR>（1）该网络发送一帧的发送延时和传输延时分别是多少？<BR>（2）网络的利用率是多少？<BR>（3）为了使网络的利用率达到&nbsp;100％，需要使用窗口是多大的回退&nbsp;N&nbsp;帧协议？<BR>（4）使用回退&nbsp;N&nbsp;帧协议的网络中，如果发送了&nbsp;0～7&nbsp;号帧，而发送端只收到了&nbsp;0、3&nbsp;号帧的回复，需要重新发送哪些帧？
									</h3>
									<a href="javascript:void(0)" onclick="collectQuestion('33228a872a684e74bc59cbac75de14b9', this, '203030532')" class="tit_collcet_btn  ">
										<i></i>
										                                        	<span class="collectText">收藏</span>
										                                    </a>
                                </div>
																									<div class="mark_answer" style="width:760px;">
    <div>
        <dl class="mark_fill colorDeep" id="qbstuAnswer883497701">
            <dt class="positionStyle" tabindex="0" role="option" >
                <i class="fontWeight">我的答案：</i>
                <div class="mark_score">
                    <div class=" fl catalog_tishi80">
                        <div class="mark_judge_name"></div>
                    </div>
                                    </div>
            </dt>

                    </dl>

                    <dl class="mark_fill colorGreen" tabindex="0" role="option" >
                <dt><i class="fontWeight">正确答案：</i></dt>
                                    <dd>(1) 已知：……，求……（0.5分）
<br>解：（1）信道的带宽为&nbsp;50&nbsp;Kbps，那么发送&nbsp;1000&nbsp;bit&nbsp;的帧需要&nbsp;1000/50000=20&nbsp;ms，而传输延时为&nbsp;500ms/2=250&nbsp;ms。
<br>（2）发送端发送信号需&nbsp;20&nbsp;ms，从发送成功到收到确认，传输延时需&nbsp;500&nbsp;ms。那么网络的利用率&nbsp;E=20/（500+20）≈4％。
<br>（3）发送窗口应该为&nbsp;520/20=26，使用的窗口大小为&nbsp;26&nbsp;时，网络利用率达到&nbsp;100%。
<br>（4）需要重发&nbsp;4、5、6、7&nbsp;号帧，因为回退&nbsp;N&nbsp;帧的协议中，接受窗口为&nbsp;1，那么如果返回了&nbsp;3&nbsp;号帧的确认，则说明之前的所有帧都发送成功，因此只需要重发之后的几帧即可。（1.5分/个）
<br>答：……（0.5分）</dd>
                            </dl>
            </div>
        <style>
    .know-point a{display:inline-block;padding:0 14px;height: 20px;line-height: 20px;font-size: 12px;color: #8A8B99;border: 1px solid #DADFE6;border-radius: 4px;margin-right: 16px;margin-bottom: 10px;}
    .know-point a:hover{border: 1px solid #3A8BFF;color: #3A8BFF;}
</style>
<div class="analysis" style="margin-top: 10px"><i>知识点：</i>
    </div>
</div>

															</div>
															</div>
			</div>
		</div>
	
	<div class="fanyaMarking_right" id="rightHeight">
		<div class="topicNumber" id="topicNumberScroll">
						
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>一. 单选题				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497362" data="883497362"
							>1</li>
											<li id="answerSheet883497363" data="883497363"
							>2</li>
											<li id="answerSheet883497364" data="883497364"
							>3</li>
											<li id="answerSheet883497365" data="883497365"
							>4</li>
											<li id="answerSheet883497366" data="883497366"
							>5</li>
											<li id="answerSheet883497367" data="883497367"
							>6</li>
											<li id="answerSheet883497368" data="883497368"
							>7</li>
											<li id="answerSheet883497369" data="883497369"
							>8</li>
											<li id="answerSheet883497370" data="883497370"
							>9</li>
											<li id="answerSheet883497371" data="883497371"
							>10</li>
											<li id="answerSheet883497372" data="883497372"
							>11</li>
											<li id="answerSheet883497373" data="883497373"
							>12</li>
											<li id="answerSheet883497374" data="883497374"
							>13</li>
											<li id="answerSheet883497375" data="883497375"
							>14</li>
											<li id="answerSheet883497376" data="883497376"
							>15</li>
											<li id="answerSheet883497377" data="883497377"
							>16</li>
											<li id="answerSheet883497378" data="883497378"
							>17</li>
											<li id="answerSheet883497379" data="883497379"
							>18</li>
											<li id="answerSheet883497380" data="883497380"
							>19</li>
											<li id="answerSheet883497381" data="883497381"
							>20</li>
											<li id="answerSheet883497382" data="883497382"
							>21</li>
											<li id="answerSheet883497383" data="883497383"
							>22</li>
											<li id="answerSheet883497384" data="883497384"
							>23</li>
											<li id="answerSheet883497385" data="883497385"
							>24</li>
											<li id="answerSheet883497386" data="883497386"
							>25</li>
											<li id="answerSheet883497387" data="883497387"
							>26</li>
											<li id="answerSheet883497388" data="883497388"
							>27</li>
											<li id="answerSheet883497389" data="883497389"
							>28</li>
											<li id="answerSheet883497390" data="883497390"
							>29</li>
											<li id="answerSheet883497391" data="883497391"
							>30</li>
											<li id="answerSheet883497392" data="883497392"
							>31</li>
											<li id="answerSheet883497393" data="883497393"
							>32</li>
											<li id="answerSheet883497394" data="883497394"
							>33</li>
											<li id="answerSheet883497395" data="883497395"
							>34</li>
											<li id="answerSheet883497396" data="883497396"
							>35</li>
											<li id="answerSheet883497397" data="883497397"
							>36</li>
											<li id="answerSheet883497398" data="883497398"
							>37</li>
											<li id="answerSheet883497399" data="883497399"
							>38</li>
											<li id="answerSheet883497400" data="883497400"
							>39</li>
											<li id="answerSheet883497401" data="883497401"
							>40</li>
											<li id="answerSheet883497402" data="883497402"
							>41</li>
											<li id="answerSheet883497403" data="883497403"
							>42</li>
											<li id="answerSheet883497404" data="883497404"
							>43</li>
											<li id="answerSheet883497405" data="883497405"
							>44</li>
											<li id="answerSheet883497406" data="883497406"
							>45</li>
											<li id="answerSheet883497407" data="883497407"
							>46</li>
											<li id="answerSheet883497408" data="883497408"
							>47</li>
											<li id="answerSheet883497409" data="883497409"
							>48</li>
											<li id="answerSheet883497410" data="883497410"
							>49</li>
											<li id="answerSheet883497411" data="883497411"
							>50</li>
											<li id="answerSheet883497412" data="883497412"
							>51</li>
											<li id="answerSheet883497413" data="883497413"
							>52</li>
											<li id="answerSheet883497414" data="883497414"
							>53</li>
											<li id="answerSheet883497415" data="883497415"
							>54</li>
											<li id="answerSheet883497416" data="883497416"
							>55</li>
											<li id="answerSheet883497417" data="883497417"
							>56</li>
											<li id="answerSheet883497418" data="883497418"
							>57</li>
											<li id="answerSheet883497419" data="883497419"
							>58</li>
											<li id="answerSheet883497420" data="883497420"
							>59</li>
											<li id="answerSheet883497421" data="883497421"
							>60</li>
											<li id="answerSheet883497422" data="883497422"
							>61</li>
											<li id="answerSheet883497423" data="883497423"
							>62</li>
											<li id="answerSheet883497424" data="883497424"
							>63</li>
											<li id="answerSheet883497425" data="883497425"
							>64</li>
											<li id="answerSheet883497426" data="883497426"
							>65</li>
											<li id="answerSheet883497427" data="883497427"
							>66</li>
											<li id="answerSheet883497428" data="883497428"
							>67</li>
											<li id="answerSheet883497429" data="883497429"
							>68</li>
											<li id="answerSheet883497430" data="883497430"
							>69</li>
											<li id="answerSheet883497431" data="883497431"
							>70</li>
											<li id="answerSheet883497432" data="883497432"
							>71</li>
											<li id="answerSheet883497433" data="883497433"
							>72</li>
											<li id="answerSheet883497434" data="883497434"
							>73</li>
											<li id="answerSheet883497435" data="883497435"
							>74</li>
											<li id="answerSheet883497436" data="883497436"
							>75</li>
											<li id="answerSheet883497437" data="883497437"
							>76</li>
											<li id="answerSheet883497438" data="883497438"
							>77</li>
											<li id="answerSheet883497439" data="883497439"
							>78</li>
											<li id="answerSheet883497440" data="883497440"
							>79</li>
											<li id="answerSheet883497441" data="883497441"
							>80</li>
											<li id="answerSheet883497442" data="883497442"
							>81</li>
											<li id="answerSheet883497443" data="883497443"
							>82</li>
											<li id="answerSheet883497444" data="883497444"
							>83</li>
											<li id="answerSheet883497445" data="883497445"
							>84</li>
											<li id="answerSheet883497446" data="883497446"
							>85</li>
											<li id="answerSheet883497447" data="883497447"
							>86</li>
											<li id="answerSheet883497448" data="883497448"
							>87</li>
											<li id="answerSheet883497449" data="883497449"
							>88</li>
											<li id="answerSheet883497450" data="883497450"
							>89</li>
											<li id="answerSheet883497451" data="883497451"
							>90</li>
											<li id="answerSheet883497452" data="883497452"
							>91</li>
											<li id="answerSheet883497453" data="883497453"
							>92</li>
											<li id="answerSheet883497454" data="883497454"
							>93</li>
											<li id="answerSheet883497455" data="883497455"
							>94</li>
											<li id="answerSheet883497456" data="883497456"
							>95</li>
											<li id="answerSheet883497457" data="883497457"
							>96</li>
											<li id="answerSheet883497458" data="883497458"
							>97</li>
											<li id="answerSheet883497459" data="883497459"
							>98</li>
											<li id="answerSheet883497460" data="883497460"
							>99</li>
											<li id="answerSheet883497461" data="883497461"
							>100</li>
											<li id="answerSheet883497462" data="883497462"
							>101</li>
											<li id="answerSheet883497463" data="883497463"
							>102</li>
											<li id="answerSheet883497464" data="883497464"
							>103</li>
											<li id="answerSheet883497465" data="883497465"
							>104</li>
											<li id="answerSheet883497466" data="883497466"
							>105</li>
											<li id="answerSheet883497467" data="883497467"
							>106</li>
											<li id="answerSheet883497468" data="883497468"
							>107</li>
											<li id="answerSheet883497469" data="883497469"
							>108</li>
											<li id="answerSheet883497470" data="883497470"
							>109</li>
											<li id="answerSheet883497471" data="883497471"
							>110</li>
											<li id="answerSheet883497472" data="883497472"
							>111</li>
											<li id="answerSheet883497473" data="883497473"
							>112</li>
											<li id="answerSheet883497474" data="883497474"
							>113</li>
											<li id="answerSheet883497475" data="883497475"
							>114</li>
											<li id="answerSheet883497476" data="883497476"
							>115</li>
											<li id="answerSheet883497477" data="883497477"
							>116</li>
											<li id="answerSheet883497478" data="883497478"
							>117</li>
											<li id="answerSheet883497479" data="883497479"
							>118</li>
											<li id="answerSheet883497480" data="883497480"
							>119</li>
											<li id="answerSheet883497481" data="883497481"
							>120</li>
											<li id="answerSheet883497482" data="883497482"
							>121</li>
											<li id="answerSheet883497483" data="883497483"
							>122</li>
											<li id="answerSheet883497484" data="883497484"
							>123</li>
											<li id="answerSheet883497485" data="883497485"
							>124</li>
											<li id="answerSheet883497486" data="883497486"
							>125</li>
											<li id="answerSheet883497487" data="883497487"
							>126</li>
											<li id="answerSheet883497488" data="883497488"
							>127</li>
											<li id="answerSheet883497489" data="883497489"
							>128</li>
											<li id="answerSheet883497490" data="883497490"
							>129</li>
											<li id="answerSheet883497491" data="883497491"
							>130</li>
											<li id="answerSheet883497492" data="883497492"
							>131</li>
											<li id="answerSheet883497493" data="883497493"
							>132</li>
											<li id="answerSheet883497494" data="883497494"
							>133</li>
											<li id="answerSheet883497495" data="883497495"
							>134</li>
											<li id="answerSheet883497496" data="883497496"
							>135</li>
											<li id="answerSheet883497497" data="883497497"
							>136</li>
											<li id="answerSheet883497498" data="883497498"
							>137</li>
											<li id="answerSheet883497499" data="883497499"
							>138</li>
											<li id="answerSheet883497500" data="883497500"
							>139</li>
											<li id="answerSheet883497501" data="883497501"
							>140</li>
											<li id="answerSheet883497502" data="883497502"
							>141</li>
											<li id="answerSheet883497503" data="883497503"
							>142</li>
											<li id="answerSheet883497504" data="883497504"
							>143</li>
											<li id="answerSheet883497505" data="883497505"
							>144</li>
											<li id="answerSheet883497506" data="883497506"
							>145</li>
											<li id="answerSheet883497507" data="883497507"
							>146</li>
											<li id="answerSheet883497508" data="883497508"
							>147</li>
											<li id="answerSheet883497509" data="883497509"
							>148</li>
											<li id="answerSheet883497510" data="883497510"
							>149</li>
											<li id="answerSheet883497511" data="883497511"
							>150</li>
											<li id="answerSheet883497512" data="883497512"
							>151</li>
											<li id="answerSheet883497513" data="883497513"
							>152</li>
											<li id="answerSheet883497514" data="883497514"
							>153</li>
											<li id="answerSheet883497515" data="883497515"
							>154</li>
											<li id="answerSheet883497516" data="883497516"
							>155</li>
											<li id="answerSheet883497517" data="883497517"
							>156</li>
											<li id="answerSheet883497518" data="883497518"
							>157</li>
											<li id="answerSheet883497519" data="883497519"
							>158</li>
											<li id="answerSheet883497520" data="883497520"
							>159</li>
											<li id="answerSheet883497521" data="883497521"
							>160</li>
											<li id="answerSheet883497522" data="883497522"
							>161</li>
											<li id="answerSheet883497523" data="883497523"
							>162</li>
											<li id="answerSheet883497524" data="883497524"
							>163</li>
											<li id="answerSheet883497525" data="883497525"
							>164</li>
											<li id="answerSheet883497526" data="883497526"
							>165</li>
											<li id="answerSheet883497527" data="883497527"
							>166</li>
											<li id="answerSheet883497528" data="883497528"
							>167</li>
											<li id="answerSheet883497529" data="883497529"
							>168</li>
											<li id="answerSheet883497530" data="883497530"
							>169</li>
											<li id="answerSheet883497531" data="883497531"
							>170</li>
											<li id="answerSheet883497532" data="883497532"
							>171</li>
											<li id="answerSheet883497533" data="883497533"
							>172</li>
											<li id="answerSheet883497534" data="883497534"
							>173</li>
											<li id="answerSheet883497535" data="883497535"
							>174</li>
											<li id="answerSheet883497536" data="883497536"
							>175</li>
											<li id="answerSheet883497537" data="883497537"
							>176</li>
											<li id="answerSheet883497538" data="883497538"
							>177</li>
											<li id="answerSheet883497539" data="883497539"
							>178</li>
											<li id="answerSheet883497540" data="883497540"
							>179</li>
											<li id="answerSheet883497541" data="883497541"
							>180</li>
											<li id="answerSheet883497542" data="883497542"
							>181</li>
											<li id="answerSheet883497543" data="883497543"
							>182</li>
											<li id="answerSheet883497544" data="883497544"
							>183</li>
											<li id="answerSheet883497545" data="883497545"
							>184</li>
											<li id="answerSheet883497546" data="883497546"
							>185</li>
											<li id="answerSheet883497547" data="883497547"
							>186</li>
											<li id="answerSheet883497548" data="883497548"
							>187</li>
											<li id="answerSheet883497549" data="883497549"
							>188</li>
											<li id="answerSheet883497550" data="883497550"
							>189</li>
											<li id="answerSheet883497551" data="883497551"
							>190</li>
											<li id="answerSheet883497552" data="883497552"
							>191</li>
											<li id="answerSheet883497553" data="883497553"
							>192</li>
											<li id="answerSheet883497554" data="883497554"
							>193</li>
											<li id="answerSheet883497555" data="883497555"
							>194</li>
											<li id="answerSheet883497556" data="883497556"
							>195</li>
											<li id="answerSheet883497557" data="883497557"
							>196</li>
											<li id="answerSheet883497558" data="883497558"
							>197</li>
											<li id="answerSheet883497559" data="883497559"
							>198</li>
											<li id="answerSheet883497560" data="883497560"
							>199</li>
											<li id="answerSheet883497561" data="883497561"
							>200</li>
									</ul>
			
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>二. 填空题				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497562" data="883497562"
							>201</li>
											<li id="answerSheet883497563" data="883497563"
							>202</li>
											<li id="answerSheet883497564" data="883497564"
							>203</li>
											<li id="answerSheet883497565" data="883497565"
							>204</li>
											<li id="answerSheet883497566" data="883497566"
							>205</li>
											<li id="answerSheet883497567" data="883497567"
							>206</li>
											<li id="answerSheet883497568" data="883497568"
							>207</li>
											<li id="answerSheet883497569" data="883497569"
							>208</li>
											<li id="answerSheet883497570" data="883497570"
							>209</li>
											<li id="answerSheet883497571" data="883497571"
							>210</li>
											<li id="answerSheet883497572" data="883497572"
							>211</li>
											<li id="answerSheet883497573" data="883497573"
							>212</li>
											<li id="answerSheet883497574" data="883497574"
							>213</li>
											<li id="answerSheet883497575" data="883497575"
							>214</li>
											<li id="answerSheet883497576" data="883497576"
							>215</li>
											<li id="answerSheet883497577" data="883497577"
							>216</li>
											<li id="answerSheet883497578" data="883497578"
							>217</li>
											<li id="answerSheet883497579" data="883497579"
							>218</li>
											<li id="answerSheet883497580" data="883497580"
							>219</li>
											<li id="answerSheet883497581" data="883497581"
							>220</li>
											<li id="answerSheet883497582" data="883497582"
							>221</li>
											<li id="answerSheet883497583" data="883497583"
							>222</li>
											<li id="answerSheet883497584" data="883497584"
							>223</li>
											<li id="answerSheet883497585" data="883497585"
							>224</li>
											<li id="answerSheet883497586" data="883497586"
							>225</li>
											<li id="answerSheet883497587" data="883497587"
							>226</li>
											<li id="answerSheet883497588" data="883497588"
							>227</li>
											<li id="answerSheet883497589" data="883497589"
							>228</li>
											<li id="answerSheet883497590" data="883497590"
							>229</li>
											<li id="answerSheet883497591" data="883497591"
							>230</li>
											<li id="answerSheet883497592" data="883497592"
							>231</li>
											<li id="answerSheet883497593" data="883497593"
							>232</li>
											<li id="answerSheet883497594" data="883497594"
							>233</li>
											<li id="answerSheet883497595" data="883497595"
							>234</li>
											<li id="answerSheet883497596" data="883497596"
							>235</li>
											<li id="answerSheet883497597" data="883497597"
							>236</li>
											<li id="answerSheet883497598" data="883497598"
							>237</li>
											<li id="answerSheet883497599" data="883497599"
							>238</li>
											<li id="answerSheet883497600" data="883497600"
							>239</li>
											<li id="answerSheet883497601" data="883497601"
							>240</li>
											<li id="answerSheet883497602" data="883497602"
							>241</li>
											<li id="answerSheet883497603" data="883497603"
							>242</li>
											<li id="answerSheet883497604" data="883497604"
							>243</li>
											<li id="answerSheet883497605" data="883497605"
							>244</li>
											<li id="answerSheet883497606" data="883497606"
							>245</li>
											<li id="answerSheet883497607" data="883497607"
							>246</li>
											<li id="answerSheet883497608" data="883497608"
							>247</li>
											<li id="answerSheet883497609" data="883497609"
							>248</li>
											<li id="answerSheet883497610" data="883497610"
							>249</li>
											<li id="answerSheet883497611" data="883497611"
							>250</li>
									</ul>
			
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>三. 判断题				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497612" data="883497612"
							>251</li>
											<li id="answerSheet883497613" data="883497613"
							>252</li>
											<li id="answerSheet883497614" data="883497614"
							>253</li>
											<li id="answerSheet883497615" data="883497615"
							>254</li>
											<li id="answerSheet883497616" data="883497616"
							>255</li>
											<li id="answerSheet883497617" data="883497617"
							>256</li>
											<li id="answerSheet883497618" data="883497618"
							>257</li>
											<li id="answerSheet883497619" data="883497619"
							>258</li>
											<li id="answerSheet883497620" data="883497620"
							>259</li>
											<li id="answerSheet883497621" data="883497621"
							>260</li>
											<li id="answerSheet883497622" data="883497622"
							>261</li>
											<li id="answerSheet883497623" data="883497623"
							>262</li>
											<li id="answerSheet883497624" data="883497624"
							>263</li>
											<li id="answerSheet883497625" data="883497625"
							>264</li>
											<li id="answerSheet883497626" data="883497626"
							>265</li>
											<li id="answerSheet883497627" data="883497627"
							>266</li>
											<li id="answerSheet883497628" data="883497628"
							>267</li>
											<li id="answerSheet883497629" data="883497629"
							>268</li>
											<li id="answerSheet883497630" data="883497630"
							>269</li>
											<li id="answerSheet883497631" data="883497631"
							>270</li>
											<li id="answerSheet883497632" data="883497632"
							>271</li>
											<li id="answerSheet883497633" data="883497633"
							>272</li>
											<li id="answerSheet883497634" data="883497634"
							>273</li>
											<li id="answerSheet883497635" data="883497635"
							>274</li>
											<li id="answerSheet883497636" data="883497636"
							>275</li>
											<li id="answerSheet883497637" data="883497637"
							>276</li>
											<li id="answerSheet883497638" data="883497638"
							>277</li>
											<li id="answerSheet883497639" data="883497639"
							>278</li>
											<li id="answerSheet883497640" data="883497640"
							>279</li>
											<li id="answerSheet883497641" data="883497641"
							>280</li>
											<li id="answerSheet883497642" data="883497642"
							>281</li>
											<li id="answerSheet883497643" data="883497643"
							>282</li>
											<li id="answerSheet883497644" data="883497644"
							>283</li>
											<li id="answerSheet883497645" data="883497645"
							>284</li>
											<li id="answerSheet883497646" data="883497646"
							>285</li>
											<li id="answerSheet883497647" data="883497647"
							>286</li>
											<li id="answerSheet883497648" data="883497648"
							>287</li>
											<li id="answerSheet883497649" data="883497649"
							>288</li>
											<li id="answerSheet883497650" data="883497650"
							>289</li>
											<li id="answerSheet883497651" data="883497651"
							>290</li>
											<li id="answerSheet883497652" data="883497652"
							>291</li>
											<li id="answerSheet883497653" data="883497653"
							>292</li>
											<li id="answerSheet883497654" data="883497654"
							>293</li>
											<li id="answerSheet883497655" data="883497655"
							>294</li>
											<li id="answerSheet883497656" data="883497656"
							>295</li>
											<li id="answerSheet883497657" data="883497657"
							>296</li>
											<li id="answerSheet883497658" data="883497658"
							>297</li>
											<li id="answerSheet883497659" data="883497659"
							>298</li>
											<li id="answerSheet883497660" data="883497660"
							>299</li>
											<li id="answerSheet883497661" data="883497661"
							>300</li>
									</ul>
			
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>四. 简答题				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497662" data="883497662"
							>301</li>
											<li id="answerSheet883497663" data="883497663"
							>302</li>
											<li id="answerSheet883497664" data="883497664"
							>303</li>
											<li id="answerSheet883497665" data="883497665"
							>304</li>
											<li id="answerSheet883497666" data="883497666"
							>305</li>
											<li id="answerSheet883497667" data="883497667"
							>306</li>
											<li id="answerSheet883497668" data="883497668"
							>307</li>
											<li id="answerSheet883497669" data="883497669"
							>308</li>
											<li id="answerSheet883497670" data="883497670"
							>309</li>
											<li id="answerSheet883497671" data="883497671"
							>310</li>
											<li id="answerSheet883497672" data="883497672"
							>311</li>
											<li id="answerSheet883497673" data="883497673"
							>312</li>
											<li id="answerSheet883497674" data="883497674"
							>313</li>
											<li id="answerSheet883497675" data="883497675"
							>314</li>
											<li id="answerSheet883497676" data="883497676"
							>315</li>
											<li id="answerSheet883497677" data="883497677"
							>316</li>
											<li id="answerSheet883497678" data="883497678"
							>317</li>
											<li id="answerSheet883497679" data="883497679"
							>318</li>
											<li id="answerSheet883497680" data="883497680"
							>319</li>
											<li id="answerSheet883497681" data="883497681"
							>320</li>
									</ul>
			
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>五. 应用题1				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497682" data="883497682"
							>321</li>
											<li id="answerSheet883497683" data="883497683"
							>322</li>
											<li id="answerSheet883497684" data="883497684"
							>323</li>
											<li id="answerSheet883497685" data="883497685"
							>324</li>
											<li id="answerSheet883497686" data="883497686"
							>325</li>
									</ul>
			
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>六. 应用题2				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497687" data="883497687"
							>326</li>
											<li id="answerSheet883497688" data="883497688"
							>327</li>
											<li id="answerSheet883497689" data="883497689"
							>328</li>
											<li id="answerSheet883497690" data="883497690"
							>329</li>
											<li id="answerSheet883497691" data="883497691"
							>330</li>
											<li id="answerSheet883497692" data="883497692"
							>331</li>
											<li id="answerSheet883497693" data="883497693"
							>332</li>
											<li id="answerSheet883497694" data="883497694"
							>333</li>
											<li id="answerSheet883497695" data="883497695"
							>334</li>
											<li id="answerSheet883497696" data="883497696"
							>335</li>
									</ul>
			
								<div class="topicNumber_checkbox colorDeep fs14">
					<span class="numRight fr" style="margin-right: 10px"></span>七. 原理题				</div>

				
				<ul class="topicNumber_list clearfix">
																<li id="answerSheet883497697" data="883497697"
							>336</li>
											<li id="answerSheet883497698" data="883497698"
							>337</li>
											<li id="answerSheet883497699" data="883497699"
							>338</li>
											<li id="answerSheet883497700" data="883497700"
							>339</li>
											<li id="answerSheet883497701" data="883497701"
							>340</li>
									</ul>
					</div>
	</div>
	<div class="maskDiv popMoveShowHide examScoreListDiv" style="display:none;" id="recordList">
		<div class="popDiv wid840 popMove" id="content">
			<div class="popHead">
				<a href="javascript:;" onclick="closeAnswers();" class="popClose popMoveDele fr"><img src="/exam-ans/mooc2/images/popClose.png"/></a>
				<p class="fl fs18 colorDeep">查看作答记录</p>
			</div>
			<div class="het62"></div>
					</div>
	</div>
</div>
</body>
<script>
	var recordLock = 0

	function answerList() {
		if (recordLock == 1) {
		    popAnswerList();
			return;
		}
		recordLock = 1;
		$.ajax({
			type: "get",
			url: "/exam-ans/exam/test/answerlist",
			dataType: "html",
			data: {
				courseId: 203030532,
				classId: 71949412,
				cpi: 198382912,
				id: 99775190,
				ut: "s",
				openc: "cf2d0a6d2cce12c5c6a90466deee261b",
				newMooc: true
			},
			success: function (data) {
				$("#content").append(data);
				popAnswerList();
			}
		});
	}
	
	function popAnswerList(){
	    $("#recordList").show();
		MoveFixed();
	}

	function closeAnswers() {
		$("#recordList").hide();
	}

	function showAnswer(selectTimes) {
		var url = "/exam-ans/exam/test/reVersionPaperMarkContentNew?courseId=203030532&classId=71949412&p=1&id=99775190&ut=s&openc=cf2d0a6d2cce12c5c6a90466deee261b&times=" + selectTimes + "&newMooc=true";
		window.open(url);
	}

	function MoveFixed() {
		$('.popMove').css({
			top: function () {
				return ($(window).height() - $(this).height()) / 2;
			},
			left: function () {
				return ($(window).width() - $(this).width()) / 2;
			}
		});

		$("#boxscroll").niceScroll({
			cursorborder: "",
			cursorcolor: "#D9DDE1",
			boxzoom: false
		});
	}
	
 $(function() {
	$('.ranktip').hover(function() {
		$(this).find('.tipsCon').addClass('tipsConHover');
		var answerId = $(this).attr('data');
		if(answerId <= 0){
			return;
		}
		if($(this).find('.rank').text() != '*'){
			return;
		}
		getExamRank(answerId);
	}, function() {
		$(this).find('.tipsCon').removeClass('tipsConHover');
	});

	 if("0" == "1"){
		 var firstFocus = $(".subNav");
		 if (firstFocus) {
			 setTimeout(function() {
				 firstFocus.eq(0).focus();
			 }, 300)
		 }
	 }
});

function getExamRank(answerId) {
    var courseId = $("#courseId").val();
    var classId = $("#classId").val();
    var cpi = $("#cpi").val();
    $.ajax({
        type: "get",
        dataType: "json",
        url: "/exam-ans/exam/test/myExamRank",
        data: {
            "classId": classId,
            "courseId": courseId,
            "answerId": answerId,
            "cpi": cpi,
            "mooc2": 1
        },
        success: function (data) {
            if (data.status) {
            	var rankText = data.examRank + '/' + data.studengCount;
            	$('.ranktip .rank').text(rankText);
            } else {
                $.toast({type: 'failure', content: '获取排名失败'});
            }
        },
        error: function (data) {
        	$.toast({type: 'failure', content: '获取排名失败，稍候重试'});
        }
    });
}
	    function collectQuestion(questionBankId, thisObj, questionCourseId) {
        var courseId = $("#courseId").val();
        var classId = $("#classId").val();
        var cpi = $("#cpi").val();
		var hasClass = $(thisObj).hasClass("over_collect_btn");
		if (!hasClass) {
			$.ajax({
				type : 'post',
				url : "/exam-ans/exam/test/selfexam-collect",
				dataType:'json',
				data : {
					"courseId": courseId,
					"personId":cpi,
					"questionBankId":questionBankId,
					"classId":classId,
					"questionCourseId":questionCourseId
				},
				success : function(data){
					if (data.status) {
                        $(thisObj).addClass("over_collect_btn");
                        $(thisObj).find(".collectText").html("");
                        $(thisObj).find(".collectText").html("已收藏");
                        $.toast({type: 'success', content: data.msg});
					} else {
                        $.toast({type: 'failure', content: data.msg});
					}
				}
			});
        } else {
            $.ajax({
                type : 'post',
                url : "/exam-ans/exam/test/cancel-selfexam-collect",
                dataType:'json',
                data : {
                    "courseId": courseId,
                    "personId":cpi,
                    "questionBankId":questionBankId,
                    "classId":classId
                },
                success : function(data){
                    if (data.status == true) {
                        $(thisObj).removeClass("over_collect_btn");
                        $(thisObj).find(".collectText").html("");
                        $(thisObj).find(".collectText").html("收藏");
                        $.toast({type: 'success', content: data.msg});
                    } else {
                        $.toast({type: 'failure', content: data.msg});
                    }
                }
            });
		}
    }
    </script>
<!-- 代码高亮开始 start -->
<link type="text/css" href="/exam-ans/views/mooc2/ueditor/insertcode/css/default.min.css" rel="stylesheet" />
<script type="text/javascript" src="/exam-ans/js/highlight.min.js" charset="utf-8"></script>
<script type="text/javascript" src="/exam-ans/js/highlightjs-line-numbers.js" charset="utf-8"></script>
<style>
    pre,code {display: block;background: #F7F8FA;border: 1px solid #E1E3E5; font-size: 14px; border-radius: 4px; padding: 30px 20px; margin: 20px 0; font-family: CXHackSafariFont,CXEmojiFont,CXChineseQuote,-apple-system,BlinkMacSystemFont,Helvetica Neue,Helvetica,Tahoma, Arial,Segoe UI,PingFang SC, Hiragino Sans GB,Microsoft YaHei,sans-serif,Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol,Noto Color Emoji; }
    pre{overflow-x: auto;margin:.5em 0;padding:.4em .6em;border-radius:8px;background:#f8f8f8;}
    pre.autolinebreak{white-space: normal; }
    code.hljs{background: #F7F8FA;}
    pre code,pre pre{ margin: 0; background: none;border: none;}/*padding: 0;*/
    .code-tool-wrap{padding-bottom: 1em;left: 20px; top: 2px; width: calc(100% - 40px); height: 24px; font-size: 14px; user-select: none;}
    .code-lang{ display:inline-block; color: #ACB4BF; }
    .ans-cc .ans-noborder th,.ans-cc .ans-noborder td{border-color:transparent;}
    .ans-cc pre,.ans-cc code{ position: relative; padding: 0px 20px 30px; margin: 20px 0;border: 1px solid #E1E3E5; border-radius: 4px; color: #474C59; background: #F7F8FA; font-size:14px; font-family: CXHackSafariFont,CXEmojiFont,CXChineseQuote,-apple-system,BlinkMacSystemFont,Helvetica Neue,Helvetica,Tahoma, Arial,Segoe UI,PingFang SC, Hiragino Sans GB,Microsoft YaHei,sans-serif,Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol,Noto Color Emoji;  }
    .ans-cc pre{overflow: auto}
    .ans-cc pre code,.ans-cc pre pre{ padding: 0; border:none; margin: 0; background: none;border-radius: 0;}
    .ans-cc pre.autolinebreak{white-space: pre-wrap;word-wrap: break-word;}
    .hljs-ln-numbers {text-align: center;color: #ccc;border-right: 1px solid #CCC;vertical-align: top;padding-right: 5px !important;}
    .hljs-ln-code {padding-left: 5px !important;}
    /* 全局去掉表格样式 */
    .ans-cc pre code table tr td {border: solid 0px #cfd4dc;text-align: left}
    /* 作业表格适配，考试表格适配 */
    .ans-cc pre table{table-layout: unset;}
    .ans-cc pre code table{table-layout: unset;}
    /* pre 标签未换行 */
    .ans-cc pre.line-numbers{clear:both}
    .ans-cc pre{clear:both}

    /* app作业库 考试库 查看样式 */

    .hljs-link, .hljs-operator, .hljs-regexp, .hljs-selector-attr, .hljs-selector-pseudo, .hljs-symbol, .hljs-template-variable, .hljs-variable {
        color: #ab5656 !important;
    }
    .hljs-deletion, .hljs-number, .hljs-quote, .hljs-selector-class, .hljs-selector-id, .hljs-string, .hljs-template-tag, .hljs-type {
        color: #800 !important;
    }
    /* 章节作业 */
    .hljs-ln span{margin-right:0}

    /* 学习通颜色覆盖 */
    .hljs-type{color:#800 !important;}
    .hljs-section,.hljs-title{color:#800 !important;font-weight:700}
    /* 背景颜色 */
    .ans-cc pre code td{background-color: unset;}
</style>
<link type="text/css" href="/exam-ans/css/newEditor.css?v=2023-0609-1900" rel="stylesheet" />
<script>
    /**
     * 保证最后加载
     */
    $(function () {
        var pre = $(".ans-cc").find('pre')
        if(pre){
            pre.each(function () {
                // debugger
                var me = this;
                var lang = me.firstChild && me.firstChild.lang;
                if (typeof (lang) == 'undefined' || lang == null || lang == "" ) {
                    lang = me.firstChild && me.firstChild.className;
                    if (typeof (lang) != 'undefined' && lang != null && lang != "" ) {
                        var split = lang.split("-");
                        lang = split[1];
                        if (lang == 'plain') {
                            lang = 'Plain Text';
                        }
                    } else {
                        lang = 'Plain Text';
                    }
                }
                me.innerHTML = '<div class="code-tool-wrap clearfix"><div class="code-lang fl">' + lang
                        + '</div><div class="copy1 fr"><i></i><span></span></div></div>' + me.innerHTML;
                me.innerHTML = me.innerHTML.replace(/<br\s*\/?>/g, "\n");
            })
        }

        hljs.initHighlightingOnLoad();
        hljs.initLineNumbersOnLoad({ singleLine:true });
    })
</script>
<!-- 代码高亮结束 end -->
</html>